50 Piston Ring Manufacturers in 2024
This section provides an overview for piston rings as well as their applications and principles. Also, please take a look at the list of 50 piston ring manufacturers and their company rankings. Here are the top-ranked piston ring companies as of November, 2024: 1.Performance Sealing, Inc., 2.Precision Rings, Inc. of Indianapolis, 3.Pacific Piston Ring Company.
Table of Contents
What Is a Piston Ring?
Piston rings are the parts necessary for a car engine to work efficiently.
They exist between the piston and cylinder, to prevent fuel gases from leaking out of the piston and cylinder. Piston rings also play a variety of other roles, such as acting as a lubricant to prevent deterioration caused by hot gases that come into contact with the piston and cylinder, keeping heat out, and preventing the piston from hitting the cylinder. Piston rings are an important component in the operation of a car.
Uses of Piston Rings
Piston rings are used in cars. Their main role is to prevent combustion gas leakage. When combustion gases leak, engine oil deteriorates faster.
Piston rings cannot completely prevent this because they expand due to the hot combustion gases, but piston rings exist because they have a purpose other than preventing combustion gas leakage.
Piston rings are a set of three rings, called top ring, second ring, and oil ring from the top, and they are attached to the piston in an overlapping manner.
Principle of Piston Rings
Piston rings are a set of three rings, of which there are two types
1. Compression Ring
Compression rings are used to eliminate the gap between the piston and cylinder and prevent gas leakage. It consists of two pieces: a top ring and a second ring.
Top Ring
The top ring is often a barrel face type, which has a solitary sliding part that hits the cylinder. This reduces wear with the cylinder.
Second Ring
Taper face type or undercut type is often used for the second ring. The tapered face type has a structure in which the sliding parts make contact, not with the surface but with a line, which makes it easy to lift the ring when it rises.
The undercut type has a structure in which the lower side is cut off. This type also makes linear contact with the cylinder surface during ascent, enabling smooth movement.
2. Oil Ring
The bottom layer uses an oil ring to control the thickness of the engine oil on the cylinder wall. The oil ring consists of two rings called rails sandwiched between spacers that have a discrete structure.
The role of the oil ring is to control the thickness of the oil film that forms between the rail and the cylinder wall. If this oil film is insufficient, a phenomenon called scuffing occurs, which causes damage to the cylinder.
These piston rings are attached to the piston. Therefore, they move back and forth more than 10,000 times per minute at the same time as the piston. By producing a moderate adhesion force, they are able to smoothly move back and forth within the cylinder without pressure changes occurring.
Since it is one of the parts that work in contact with combustion gas in the engine, it is important that the material be able to withstand high temperatures and wear. For this reason, cast iron and steel are used. Recently, however, steel, which has high wear resistance, is often used.
Other Information on Piston Rings
Functions of Piston Rings
1. Combustion Gas Seal
The cylinder wall and piston rings seal the gases generated during combustion to prevent them from leaking into the cylinder.
2. Engine Oil Control
A film of engine oil is created on the cylinder wall to prevent the cylinder and piston from being scratched, a phenomenon known as seizure. The thickness of this film is adjusted by the Piston Rings. In addition, the piston rings play a role in preventing excess engine oil from entering the combustion chamber.
3. Heat Transfer Function
The heat transfer function is responsible for releasing the heat generated by the gas explosion. It prevents the engine from overheating by releasing heat from the top of the piston to the Piston Rings and from there to the cylinder.
4. Piston Posture Support
This function prevents the piston from hitting the cylinder. The piston rings allow the piston to move smoothly, even when the piston is in an oblique position.
List of 50 Piston Ring Manufacturers
*Including some distributors, etc.
Sort by Features
- Default
- Company Size: largest first
- Year Founded: oldest first
- Year Founded: earliest first
Sort by Area
- United States of America
- China
- India
- Japan
- Taiwan
- United Kingdom
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Performance Sealing, Inc.
CUSTOM PISTON RING
Manufacturer Overview
Performance Sealing, Inc. is a manufacturer of engineered high-pressure polymer seals, bearings, and related components, located in Irvine, CA, and founded in 1868. The product line has spring-energized PTFE seals, hydraulic seals, self-lubricating polymer bearings, and PTFE rotary seals used in the scientific instrumentation, oil & gas, industrial equipment, semiconductor, and aerospace industries. The ISO 9001-certified company offers custom seal engineering services with capabilities such as design, rapid prototyping, reverse engineering, in-house testing, and providing installation tools.
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Hastings Manufacturing Company, LLC
Piston Rings
Manufacturer Overview
Hastings Manufacturing Company, LLC, founded in 1915 and headquartered in Hastings, Michigan, is a manufacturer of piston rings for original equipment manufacturers worldwide. Its offerings include top compression, second compression, and oil control rings for various applications, such as car, truck, motorcycle, lawn and garden, and compressors. Some of the products offered include Flex-Vent oil rings, PowerFLEX Precision Racing rings, and Motor Honey oil treatment. These products are used to improve combustion efficiency and reduce oil consumption.
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Precision Rings, Inc. of Indianapolis
Piston Rings
Manufacturer Overview
Precision Rings, Inc., headquartered in Indianapolis, Indiana, United States, has been a manufacturer of high-temperature piston rings and seal rings since 1949. Some of the products that the company offers include piston rings, seal rings, compressor rings, and custom rings. These products are used in diverse applications, including aircraft engines, automotive engines, diesel engines, and compressors. The company is also ISO 9001:2015 and AS9100D certified. Additionally, the company is also involved with some of the cutting-edge technologies such as advanced fuel delivery systems, deep underwater drilling systems, and advanced engine propulsion design.
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Neutronics Enterprises Inc.
iglide Piston Rings
Company Overview
Neutronics Enterprises Inc., established in 1983 and located in Los Gatos, California, USA, is a manufacturer and supplier of advanced brushless motors. The company's product range includes a diverse array of brushless motors, such as outrunner motors, inrunner motors, sensorless motors, and high-voltage motors. These products cater to various industries such as radio-controlled (RC) vehicles, robotics, military, aerospace, and industrial sectors. Its services include comprehensive support solutions, including technical assistance, training, and spare parts. The company also delivers quality products and services that consistently surpass expectations making it a dependable partner in motion control solutions.
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Pacific Piston Ring Company
Piston Rings
Company Overview
Pacific Piston Ring Company, established in 1921 and based in Culver City, CA, USA, is a manufacturer and supplier of piston rings. The company's product range includes piston/sealing rings for pneumatic and hydraulic valves and actuators, landing gears, auxiliary power units, compressors, and bleed air valves and controls. These products find applications in pressurization and deicing systems, turbine engines, and ballistic devices. They serve industries such as aerospace, small two-cycle power units, and automotive aftermarkets. The company adapts to customer needs, providing consistent manufacturing and leveraging technology for current and future applications.
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TOTAL SEAL, INC.
Piston Rings
Company Overview
TOTAL SEAL, INC., established in 1967 and based in the USA, is a manufacturer and supplier of piston rings. The company's product range includes Conventional Gap rings, Gapless 2nd rings, Gapless Top rings, Gas Ported rings, and Severe Duty Diesel rings. These products improve the efficiency and durability of engines. The company serves industries such as competition racing, vintage automotive, aviation, and marine. The company's services include custom ring design, manufacturing, specialized coating offerings, and personal technical assistance.
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Grover Corporation
Piston Rings
Company Overview
Grover Corporation, established in 1929 and based in Glendale, WI, U.S.A., is an ISO 9001:2015 certified manufacturer and supplier of piston rings. The company's product range includes permaseal, piston rings, piston ring seals, and materials made from cast iron, bronze, and steel. These products are integral for applications in shock absorbers, pneumatic cylinders, torque converters, and hydraulic clutches. They serve industries such as Industrial Machinery Manufacturing, Hydraulic Systems, and Pneumatics. The company'sservices include custom engineering, swift delivery, support for unique applications, and provision of coatings and specific materials.
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Grant Piston Rings
Piston Rings
Company Overview
Grant Piston Rings, established in 1922 and based in Anaheim, California, U.S.A., is an ISO 9001 certified manufacturer and supplier of piston rings. The company's product range includes Piston Ring Basics, Piston Ring Styles, and Materials and Coatings. These products are designed to enhance engine performance in passenger cars, light trucks, industrial engines, air brake compressors, and motorcycles. They serve industries such as Automotive, Industrial Engineering, and Motorsports. The company's services include continuous research into advancements in technology, product design enhancements, efficient manufacturing processes, and ensuring ease of installation of the engine.
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Hockert Sales
STAINLESS STEEL NITRIDED RACE RINGS
Distributor Overview
Hockert Sales is a US-based distributor of chiropractic equipment and supplies founded in 1987 and headquartered in Isanti, Minnesota. The company’s product offerings include a range of activator tables, flexion tables, intersegmental traction-roller tables, massage chairs, as well as disinfectant and germicidal cleaners. It also offers laser systems, nutritional supplements, various clinic supplies, and patient care products. The company distributes products from multiple brands, including Amrex, Apollo, Anabolic Laboratories, Biofreeze, and Biospec. It caters to the healthcare sector in the United States and other regions.
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George Ceramic
Piston Rings
Manufacturer Overview
George Ceramic, founded in China, is a manufacturer of interior and exterioer tiles and roof tiles. The company's product portfolio includes Decorative Ceramic Tiles, Glazed Ceramic Tiles, Handcrafted Ceramic Tiles, and Subway Tiles. It also offers porcelain roof tiles built to withstand severe weather and replicate roofing materials including shake, terracotta, and slate shingles. Its products are used in Residential Construction, Commercial Construction, Hospitality and Restaurants, and Retail and Commercial Spaces.
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OILES CORPORATION.
Piston Rings
Manufacturer Overview
OILES CORPORATION, a distinguished manufacturing company, excels in diverse domains, leading in Oilless Bearings production and sales, along with precision machinery, office equipment, and components The company thrives in construction and civil engineering equipment, architectural projects, and telecommunications solutions. Engaged in research, indemnity insurance, and real estate management, their global footprint is cemented by ISO certifications across the Americas, Asia, China, Europe, and Japan. OILES CORPORATION embodies excellence across a spectrum of sectors.
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Riken Corporation
Piston Rings
Manufacturer Overview
Riken Corporation, established in 1927 and headquartered in Tokyo, Japan, is a manufacturer known for producing engine and vehicular components. Its product range includes piston rings, brake parts, camshafts, steering knuckles, valve lifters, and valve seats. Piston rings help seal combustion chambers, manage engine oil consumption, and facilitate heat transfer. Brake parts are integral to vehicle braking systems, while camshafts control fuel intake and exhaust. Steering knuckles are vital for steering and suspension. Valve lifters and seats are key components of engine valve trains. The company has been honored with internal research awards, and its supercomputer, Fugaku.
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Omniseal Solutions
Polymer Thermoplastic Materials
Manufacturer Overview
Omniseal Solutions is based in Garden Grove, California, USA, and is a manufacturer of wear control and sealing products for the industrial sectors that was originally established as Furon in 1955. The company’s products include various electron-beam physical vapor deposition (EBPVD) materials, such as ingots. These are for incorporation into seals made with polytetrafluoroethylene (PTFE) and other plastic or rubber compound products. The company chiefly serves clients in the aerospace, automotive, and energy sectors.
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Trelleborg AB
Compact Seal Polypac DBM
Manufacturer Overview
Trelleborg AB, a company founded in 1905 and headquartered in Trelleborg, Sweden, is a manufacturer that provides solutions for extreme cold, heat, pressure, or the tremendous power of nature. The company offers a wide range of products, including Cassette Seal CSL 1500, Pneumatic seals, O-rings, and more. It also has a shop called Seals-Shop that offers various products, such as Rod and Piston Seals. It provides rubber wear liners with synthetic rubber and chemical resistance. It has received the Excellence in Quality 2018 Award and Certificate of Merit from Hyster-Yale Group. It serves various industries, including Aerospace, Agriculture, and more.
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FTL Technology
multi-diameter pipeline pigging solution
Manufacturer Overview
FTL Technology, founded in 1973 and headquartered in Leeds, England, is a manufacturer of custom-engineered sealing solutions. The company designs and produces seals, bearings, and other custom-engineered solutions for critical applications in a range of industries, including oil & gas, food, and pharmaceuticals. It also offers many resources such as case studies, white papers, and test reports of its products. The company has acquired the ISO 9001 certification for quality standard management.
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Hi-Tech Seals
PISTON RINGS
Manufacturer Overview
Hi-Tech Seals Inc. is a manufacturer of sealing and gasket components established in 1990 and headquartered in Edmonton, Alberta, Canada. The company’s products include a wide selection of o-rings, seal kits, and gaskets. It offers products fabricated from BoKure urethane, KasPex PEEK, and RyFlor compounds. The company primarily serves clients in the oil and gas, water treatment, and aerospace sectors. It also offers custom molding services, in-house rapid prototyping, and optical measurement inspections.
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Jinan Xin Ju Heng Auto Parts Co., Ltd.
Piston Rings
Manufacturer Overview
Jinan Xin Ju Heng Auto Parts Co., Ltd., established in 2005 and situated in Jinan, Shandong, China, is a manufacturer and supplier of auto parts. Formerly known as Jinan Shun Cheung Auto Parts Co., Ltd., and rebranded as Jinan Xin Ju Heng Auto Parts Co., Ltd. in 2010. The company specializes in providing replacement parts such as gear box parts, chassis parts, and engine parts for several truck brands such as Foton, Shacman, FAW, and Weichai. These components are serving spanning more than 20 countries, and some of its main markets include China, Saudi Arabia, Sudan, and the CIS countries.
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Tenneco Inc.
Engine Piston Rings
Manufacturer Overview
Tenneco Inc., established in 1999 and headquartered in Northville, Michigan, is an automotive component manufacturer specializing in products for original equipment and the aftermarket for ride control and emissions. The company's product portfolio consists of automotive components, including shocks and struts, shock absorbers, mufflers, and performance exhaust products. The company is organized into four distinct business groups: DRiV, Performance Solutions, Clean Air, and Powertrain. It plays a pivotal role in driving advancements in global mobility by delivering technology solutions for diverse global markets, including light vehicles, commercial trucks, off-highway vehicles, industrial applications, motorsport, and the aftermarket.
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Cross Manufacturing Company
Piston rings
Manufacturer Overview
Cross Manufacturing Company, established in the 1920s and headquartered in Devizes, England, is a designer and manufacturer of heat-resistant wrought alloy sealing rings and associated products. Its product line includes heat-resisting wrought alloy sealing rings, aerospace brush seals for gas turbines, and sealing rings for turbochargers. These components serve industries such as aerospace, automotive, and power generation worldwide. The company offers a complete package for the design and manufacture of large diameter metallic seals for use in hot and challenging environments. Furthermore, the company partners with the University of Bath, collaborating on research and development projects to advance sealing technologies.
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TPR CO.,LTD.
Piston Rings
Manufacturer Overview
TPR Co., Ltd., established in 1939 and located in Tokyo, Japan, is a manufacturer that provides components for the automotive industry. The company offers various products and services, including piston rings, cylinder liners, valve sheets, and automotive exterior parts. It also offers automotive goods and devices for testing and maintenance. Its product offers resistance to weathering and chemicals, broad temperature range and durometers, and is recyclable and reusable. It serves a diverse range of industries, including automotive, transportation machinery, industrial machinery, power generation, aerospace, alumina and aluminum production, and more.
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AD Piston Rings
Piston Rings
Manufacturer Overview
AD Piston Rings is a manufacturer of cast iron piston rings that is headquartered in Cleveland, Ohio, and was established in 1921. The company specializes in manufacturing piston rings and seals for industrial uses such as hydraulic and pneumatic applications, compressors and stainless steel plunger rings for the die casting sector. ADPR produces cast iron and bronze aluminum piston rings which are used in hydraulic, hydro-electric, and lock or dam applications. The company's products are used in a multiple industries, including hydraulics, construction, and manufacturing. The company offers multiple services, such as custom manufacturing, precision grinding, and wax coating.
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Kolbenring India
Piston Rings
Company Overview
Kolbenring India, established in 1972 and based in Ahmedabad, Gujarat, India, is an ISO 9001, ISO 14001, and OHSAS 18001 accredited manufacturer and supplier of piston rings. The company's product range includes Piston Rings, Spares for Cone Crushers, and R- Rings, products made from Cast Iron and SG Iron. These products are used in power engines, marine engines, and equipment maintenance. They serve industries such as Locomotives, Compressors, Industrial Valves, and Shock Absorbers. The company ensures timely delivery, provides testing facilities, and has an in-house state-of-the-art foundry and machine workshop.
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Taiwan Japon Traffic Tech Co., Ltd.
Piston Rings
Company Overview
Taiwan Japon Traffic Tech Co., Ltd., established in 1992 and based in Dali City, Taichung County, Taiwan, is a manufacturer and supplier of piston rings. The company's product range includes Piston Rings, Inspection Equipment, Motorcycle Parts, Machines, and Motorcycle Piston Ring. These products are utilized in power engines and motorcycle assemblies. They serve industries in China, Taiwan, the U.S.A., and the European zone. The company's services include quality assurance, Nitride Steel Rings provision, and Coating Test Reports.
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Grindlays Engine Parts Pvt. Ltd
Piston Rings
Company Overview
Grindlays Engine Parts Pvt. Ltd, established in 1965 and based in Delhi, India, is an ISO 9001:2015 certified manufacturer and supplier of engine parts. The company's product range includes Piston Rings, Pistons, Piston Pins, Cylinder Sleeves, and Cylinder Liners. These products are used in personal cars, two and three-wheelers, commercial vehicles such as trucks, and LCVs, and industrial equipment like Ammonia Compressors. They serve industries such as personal automotive, commercial transportation, industrial machinery, and marine engineering. The company's services include manufacturing with state-of-the-art machinery, quality assurance, ongoing research and development, and customization of products.
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SEACO International Co., Ltd
Piston Rings
Company Overview
SEACO International Co. Ltd., established in 1975 and based in Taichung city, Taiwan, is a manufacturer and supplier of piston rings. The company's piston rings include V22C for Hino-V22C, V22D for Hino-V22D, air compressor ring for AC as well as auto and engine parts. These products are mainly used in engines across various vehicles such as automobiles, heavy-duty vehicles, construction machinery, and agricultural machines. The company primarily serves industries like automotive, heavy machinery, construction, and agriculture, and also provides services including precision engineering, customized production, and global distribution.
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C.T.I. Traffic Industries Co., Ltd,
Piston Rings
Company Overview
C.T.I. Traffic Industries Co., Ltd, established in 1973 and based in Tainan City, Taiwan, is an ISO-certified manufacturer and supplier of auto engine parts. The company's product range includes a Piston Ring, Overhaul Engine Gasket, Timing Kit and Components, Liner Kit, and Hydraulic Brake System. These products are used for automotive, agriculture, off-highway, and heavy-duty truck applications. Serving sectors like the global vehicle aftermarket, it serves automotive, agriculture, and heavy-duty trucks. The company also offers engine solutions, provides over 12,000 engine references, and operates as a one-stop shop for engine components needs.
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QIN QUALITY INDUSTRIALE
Piston Rings
Company Overview
QIN QUALITY INDUSTRIALE, established in 1956 and based in Genova, Italy, is a manufacturer and supplier of piston rings. The company's product range includes piston rings from 160mm to 980mm bore, fire bands, repair bushes, QIN53 coatings, and scientifically advanced coatings. These products find applications in sealing combustion gases, minimizing carbon deposits on piston surfaces, and reconditioning cylinder liners. They serve industries such as Marine, Industrial, Rail, and Power Generation. Additionally, it offers swift delivery, customization with no minimum quantity restrictions, and manufacturing in line with customer requirements.
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THN BV
Piston Rings
Company Overview
THN BV, established in 1940 and based in Enschede, Netherlands, is an ISO 9001:2015 certified manufacturer and supplier of Zuigerveren (piston rings). The company's product range includes Fey sealing and retaining rings, Plain bearings, Sintered filters, hardened ground shafts, and Linear components. These products are used in machinery maintenance, sealing applications, and linear motion systems. They serve industries such as Wholesale, Manufacturing, and Mechanical Engineering. The company's services include rapid delivery, modernized logistics, investment in the modernization of its facilities, and updated IT infrastructure.
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PARKER HANNIFIN JAPAN LTD
Piston Seals
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CareStart
PISTON RING
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Siemens Healthcare GmbH
Piston Ring
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AMIR MARINE Co. Ltd.
Piston Rings
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Kuna Systems
Piston Rings
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Canary Connect, Inc.
Piston ring sets
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M.Barnwell Services Limited
Cast Iron Piston Rings
Distributor Overview
M.Barnwell Services Limited, founded in China in 1972, is a supplier of Fluid Sealing Products and Services. The company's product portfolio includes a diverse array of gaskets and seals for various applications, ensuring leak-free and reliable fluid containment, packing solutions used to prevent leakage and ensure the smooth operation of valves and pumps. O ring and tailored sealing products and services. It serves markets such as OEMs in Automotive, Agriculture, and Construction.
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IAC Acoustics UK Ltd
PISTON RINGS
Distributor Overview
IAC Acoustics UK Ltd., established in 1949 and headquartered in Chandler's Ford, England, operates as a supplier specializing in engineered noise and acoustic control solutions. The company offers a range of products, including powertrain anechoic chambers, hearing screening booths, standard acoustic booths, industrial acoustic barriers, and industrial absorption panels. These solutions are applied across various sectors, such as aerospace, commercial construction, healthcare, industrial engineering, and transport. The company collaborates with partners including Welan Technologies, IAC Ltd., Panda Medical Limited, Amplivox, and MARVINACUSTICA.
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MAHLE Trading Shanghai Co., Ltd.
Piston Rings
Distributor Overview
MAHLE Trading Shanghai Co., Ltd., based in Shanghai, China, is a supplier of a broad range of engineering tools and equipment. The company distributes bearings, pistons, cylinder head covers, gaskets, and filters. It also supplies air conditioning products, radiators, interior blowers, starter motors, and alternators. Its bearings which have diameters from 27 to 140 mm and bushings from 6 to 105 mm are used on valve rocker shafts, camshafts, conrods, crankshafts, and balancer shafts in combustion engines.
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Summit Racing Equipment
Piston Rings
Distributor Overview
Summit Racing Equipment, founded in 1968 and located in Tallmadge, Ohio, is a distributor of automotive parts. The company’s diverse range of products includes cooling and heating, engines and components, exhaust, exteriors and accessories, and fasteners and hardware. These products have specific applications, including engine temperature regulation, performance enhancement, exhaust flow improvement, exterior and interior customization, and secure assembly through fasteners and hardware. These applications are used in the automotive industry to address the diverse needs of vehicle owners. The company's offerings cater to sectors within the automotive industry, including maintenance, restoration, and the aftermarket.
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Piston Ring Manufacturer Ranking
*Including some distributors, etc.Ranking as of November 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Performance Sealing, Inc. |
6.5%
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| 2 | Precision Rings, Inc. of Indianapolis |
5.4%
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| 3 | Pacific Piston Ring Company |
4.6%
|
| 4 | Tenneco Inc. |
4.3%
|
| 5 | Hastings Manufacturing Company, LLC |
4.2%
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| 6 | TOTAL SEAL, INC. |
3.6%
|
| 7 | Riken Corporation |
3.6%
|
| 8 | Grant Piston Rings |
3.5%
|
| 9 | Cross Manufacturing Company |
3.5%
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| 10 | Grover Corporation |
3.3%
|
Derivation Method
The ranking is calculated based on the click share within the piston ring page as of November 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
- Hitachi Metals, Ltd.: 27,771
- Riken Corporation: 4,153
- OILES CORPORATION.: 1,993
Newly Established Company
- Jinan Xin Ju Heng Auto Parts Co., Ltd.: 2005 (19 years ago)
- Coresyn Pharmatech Co., Ltd.: 2005 (19 years ago)
- Taiwan Japon Traffic Tech Co., Ltd.: 1992 (32 years ago)
Company with a History
- Pacific Piston Ring Company: 1921 (103 years ago)
- Portsmouth Aviation Ltd: 1929 (95 years ago)
- Grover Corporation: 1929 (95 years ago)
Piston Ring Manufacturers in United States
*Including some distributors, etc.
- Performance Sealing, Inc.
- Hastings Manufacturing Company, LLC
- Precision Rings, Inc. of Indianapolis
- Neutronics Enterprises Inc.
- Pacific Piston Ring Company
- TOTAL SEAL, INC.
- Grover Corporation
- Grant Piston Rings
- Sekisui Diagnostics, LLC
- Steelhead Composites, Inc.
- Hastings Manufacturing Company
- Hockert Sales
Global Distribution of Piston Ring Manufacturers by Country
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
United States of America
|
12 | 38.7% |
India
|
7 | 22.6% |
China
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4 | 12.9% |
Japan
|
3 | 9.7% |
United Kingdom
|
3 | 9.7% |
Taiwan
|
2 | 6.5% |
