... prices and best service. Features:1) AS-568, PG standard and non-standard size O-rings 2) Various colors available, such as ... : silicone, fluoro silicone, viton(FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber, SBR, IR, IIR(butyl rubber), CR (neoprene), EPDM, SBR, AU, ACM, CO ... physical property6) Customers' designs and specifications are acceptedPacking:500pcs/bag Standard O_Rings