NBR rubber ring (LRD-15) 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 ... you need them.. NBR silicone viton NR rubber ring (LRD-15)