Silicone rubber o-ring 1.Certificate:ISO9001:2008 2.Material:NR.NBR.EPDM.etc 3.Different sizes Product NameSilicone rubber o-ringCertificateISO9001: ... of Silicone rubber o-ring according to your drawing or samplesMatetialNBR, NR ,EPDM ,SBR ,SR ,CR ,IIR ,etc.PackingInner packing is ... by plastic bag outer packing is by carton and woodenPayment termT/T, L ...