... rubber/ silicone o ring we supply EPDM rubber o ring, silicone rubber o ring, ACM rubber o ring, NBR rubber o ring, HNBR rubber o ring, FPM rubber ... o ring, CR rubber o ... ring, viton o ring, etc.Rubber o ring descriptions:1. Materials: FPM, also HNBR, NBR, SI, EPDM, ACM,PU, SBR, CR, ...