Silicone rubber o ring 1.Material Silicone 2.Good tensility,wearing 3.ROHS,ISO9001,14001 4.Type ... ,X ring,V ring,U ring Silicone Rubber o ring 1. Main materialSilicone rubber, also can use Natural rubber, SBR, NBR, IIR, PU, ... ,let me know the use).Hardness or duro.Tolerence.Color.QuantityMORE Rubber ringhttp://www.shanrong-rubber.cn/productgrouplist-212134849/Rubber_ring.html Silicone rubber o ring