nbr rubber o ring industrial o ring epdm o ring food grade,cr,epdm,viton,neoprene,nbr,NR reliable manufacturer,good quality √ material: EPDM ... , SBR,CR, NBR, NR,silicone rubber;√ hardness: shore A 30-90;√ Application: automotive, industrial, medical, agricultural ... call us so that we can communicate quickly, thank you! nbr rubber o ring