... Silicone Any size and color are available O-ring (Rubber o-ring,Silicone o-ring,o-ring seal) Features: 1) Main products: O-rings ... (AS-568 standard, PG standard and any non-standard o-ring), washer, oil seal, cup seals, gaskets, U-rings, V-rings ... , back-up rings, etc.2) Custom design rubber parts3) Materials include: silicone rubber, nitrile rubber, EPDM, neoprene rubber, viton DuPont & Dow ...