... V ring,O ring,etc CR Rubber o ring 1. Main materialNeoprene(CR),also can use Natural rubber, SBR, NBR, IIR, PU, ... industry. For example, air blower, water pump, instrument, measuring of ships and so on.7. Main performanceCR has good mechanical ... know ,let me know the use).Hardness or duro.Tolerence.Color.QuantityMORE Rubber ringhttp://www.shanrong-rubber.cn/productgrouplist-212134849/Rubber_ring.html