... Standard,:1.JIS B 24012.AS568A3. GB/T3452.11)Rubber O-RING NBR o-ring, EPDM o-ring, ... , Siliconeo-ring,FKM o-ringRubber Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 SHOREColors ... Silicone o-ring,FKM o-ringRubber Seal ring,seal circle,rubber seal ring2)AS568, JIS B 2401, Hardnes50-90 ... blue, brown, green, red, white, purpleROHS approvedHardness:60-90 shore Contact me!!!