Gas spring or gas cylinder for office chair 1.Pass SGS test 2.100000 times ... sample 1.Gas Lift,Gas Spring ,Gas Cylinder,Gas Strut for Office Chair,Bar Stool,Table 2. Stroke(mm): 80,100 ... 000 Times Testing) 6.Pressure(N): 300--450 7.Bottom Color: White,Black,Orange,Blue,Gray,Green 8. Warranty: 5 years ... 9. OEM Service10.ISO9001 Certificate. gas spring or gas cylinder for Office Chair and bar chair