... ring 1.Material CR 2.Good tensility,wearing 3.ROHS,ISO9001,14001 4.Type: ... ,U ring,V ring,O ring,etc CR Rubber o ring 1. Main materialNeoprene(CR),also can use Natural rubber, SBR, NBR ... Rubber ringhttp://www.shanrong-rubber.cn/productgrouplist-212134849/Rubber_ring.html CR rubber o ring