... , PG, DIN, BS standard and non-standard Silicone O-Rings 2) Various colors available Features:1) AS-568 ... , PG standard and non-standard Silicone O-rings 2) Various colors available, such as black, ... materials: silicone, fluoro silicone, viton(FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber, SBR, IR, IIR(butyl rubber), CR ... and specifications are acceptedPacking:500pcs/bag silicone o-ring