Gas spring or gas cylinder for office chair 1.Pass SGS test 2.100000 times fatigue test 3.Surface ... Lift,Gas Spring ,Gas Cylinder,Gas Strut for Office Chair,Bar Stool,Table 2. Stroke(mm): 80,100, ... Chrome 4. Standard: Class 2,Class3,Class 4 5. SGS BIFMA X5.1(100, 000 Times Testing) 6.Pressure( ... 8. Warranty: 5 years 9. OEM Service10.ISO9001 Certificate. gas spring or gas cylinder for Office Chair and bar ...