NBR rubber ring Material:NBR,EPDM,SILICONE,VITON,NR....... Size:AS568 and PG series,all size we can do. NBR rubber ring (LRD-15)1.Material ... : NBR,EPDM,SILICONE,VITON,NR.......2.Size: AS568 and PG ... be hesitate to contact us if you need them.. NBR silicone viton NR rubber ring