We make auto o-rings assortment kits according to the drawings or samples from customers with various shape, dimension and color, Example rubber rings, bellows, seals, hose, plug, bumper and so on, The main rubber raw material is EPDM, NR, SBR, Nitrile, Silicone, Fluorosilicone, Viton(FKM), Neoprene, Urethane(PU), Polyacrylate(ACM), Ethylene Acrylic(AEM), HNBR, Butyl(IIR) with 30~90 Shore A hardness.