... decorative o-rings, HNBR, Buna, FVMQ, MVQ, ACM, FLS, CR, SBR, SI, BR, IR, EPDM, IIR, butyl, PU, E ... can be ±3 shore A for special products o-ring. 4. Size tolerance: exactly upon your request ... transparent, green, red, yellow, grey, purple, pink thick o ring, etc. or upon your color codes. 6. Processing: ... products and sincere service. In addition to o ring we also produce outside oil seal, rubber seal ...