MaterialNBR, Viton, EPDM Silicone and so onHardness30~90 Shore AColorBlack, blue, green and ... orders are welcome.1、Compound from world class suppliers, NBR, EPDM, VITON (FKM), HNBR, etc material and pantone code available, hardness ... house tool making and free of tooling charge for standard rubber ring, the mould line can be 45°. and 180°.. 5 ...