Gas spring or gas cylinder for office chair 1.Pass SGS test 2.100000 times fatigue test 3. ... 1.Gas Lift,Gas Spring ,Gas Cylinder,Gas Strut for Office Chair,Bar Stool,Table 2. Stroke(mm): 80,100,120,140 ... . SGS BIFMA X5.1(100, 000 Times Testing) 6.Pressure(N): 300--450 7.Bottom Color: White,Black,Orange,Blue,Gray ... . OEM Service10.ISO9001 Certificate. gas spring or gas cylinder for Office Chair and bar ...