CYPR is a technology company that specializes in R&D, design and production of various piston rings. It was established in 1976. In 1995, it established a joint venture piston ring manufacturing company with American Asimco Group. In 1998, it entered into technical cooperation with Japan Piston Ring Co., Ltd. (NPR), with an annual production capacity of 180 million pieces, more than 5,800 varieties and specifications, a domestic market share of 25%, and an engine supporting surface exceeding 90%. It is the largest professional manufacturer of piston rings in China . It is the OEM of MAN, Daihatsu and Yanmar etc diesel engine manufacturers in China.