... 568, 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, ... (FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber, SBR, IR, IIR(butyl rubber), CR (neoprene), EPDM, SBR, AU, ACM, ... designs and specifications are acceptedPacking:500pcs/bag silicone o-ring