... ,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine parts and accessories,compression mold , etc. 4. Certification:ISO9002:2009, TS16949 ... ,black ,blue ,yellow,green ,brown ,etc.7. Standard:AS568,DIN3771,JIS B2401,ISO3601,BS1806.8. Accept sample or product drawing on ... ,but o-ring's mold fee is free nbr rubber parts