1.Most convenient and economical sealing elements 2.Moulds which satisfy the standards of GB, JIS, AS568, ISO3601, DIN3771 are offered. 3.Supplying different material O-RING according to the customer''''''''s requirement (Such as silicon rubber, Viton, etc). 4.Supplying special O-ring for new cold media R134α(HNBR O-RING) 5.Supplying high-wearable O-RING which can be rotated or reciprocated more than one million times.