NBR O Ring 1.Material:Silicone,NBR,NR,SBR,EPDM,IIR,CR etc 2.High durable and good sealed 3.Various features NBR ... NBR,NR,SBR,EPDM,IIR,CR etc2.High durable and good sealed3.Various features according to your requirement: waterproof,oil resistant,abrasion ... resistant4.Any shape according your drawing5.Any hardness5.Innoxious and widely used in mechanism and industry6.Certificate:ISO9001:2000,RoHS....