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 series,all state standare and non-state standard ... to contact us if you need them.. NBR silicone viton NR rubber ring