... Material NR 2.Good tensility,wearing 3.ROHS,ISO9001,14001 4.Type:O ring,X ring,V ring,U ring, ... ,U ring,etc 3. Prolong machine life, reduce maintenance costs 4. Used for sealing water, oil, air 5.Resisting oil, ... creep and stress relaxation resistance Better abrasion resistance Highest volume general purpose synthetic rubber Low Cost! NameValueMain materialNatural rubberCertificationISO 9001, 14001, ...