... and ROHS approved. 1. Offer a wide range of rubber ball in all standard size and a lot of special size. 2 ... . All rubber products are made according to international standard: ISO 3601 ... Buna-N (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL, SBR, Neoprene, HYPALON, etc. PEEK Ball