X ring is a kind of sealing ... air conditioning, etc.3. Main products: O-Ring.X Ring V-Ring.R-Ring. Y-Ring.U-Ring ... , engine parts and accessories,compression mold , etc. 4. Certification:ISO9002:2009, TS16949 ,NSF ,ACS .WRC ,FDA ,UL ,KTW, ... NSF ,ACS .WRC ,FDA ,UL ,KTW,W270, ROHS, SGS ,ISO9002:2009, .Export Ratio: 51% - 60% Current Export Market: ... Shore-A Hardness Tester, Optical Projector rubber x seal