NR Rubber O ring 1.Certificate: ISO9001:2008 2.Material: NR, EPDM, Silicone, etc 3.Different sizes are available Product NameNR Rubber O ringCertificateISO9001 ... oilSizeWe can provide you with many different sizes of rubber ring according to your drawing or samplesMatetialNBR, NR ,EPDM ,SBR ,SR ...