Zhejiang HuaDong Piston Ring CO., LTD. was established in 1997, located in Ruian City which is the center of auto parts and motorcycle parts in China. In 1999, our factory passed ISO9001 international quality system, and we passed ISO/TS16949 quality system in 2011, improving our international leading quality management level. Our company takes science and technology guide, introduced into advanced production equipment. We test our rings by advanced testing instruments. Strictly according t...View More