... oil seals , rubber flat washers, rubber Circles, Gaskets, engine parts and accessories,compression mold , etc. 4. Certification:ISO9002:2009, TS16949 ,NSF ... W270, ROHS, SGS .5. Packing: neutral or as per client's requirement.6. Colour: red ,white,black ,blue ,yellow,green ... size9. Different sizes and color can be make on your requirement ,but o-ring's mold fee is free. rubber products and accessories