As a manufactory we can supply all kinds of rubber washers for you . Detailed Product Description Features:1) Available material: ... (FKM), viton DuPont & Dow elastomers, neoprene, HNBR, NBR + PVC, natural rubber, SBR, IR, IIR (butylrubber), CR (neoprene), SBR, AU, ACM, CO ... as iron, copper, aluminium and stainless steelInner packing:500pcs/bag Rubber seals