Gas spring or cylinder for Various chairs 1.Pass SGS test 2.100000 ... sample 1.Gas Lift,Gas Spring ,Gas Cylinder,Gas Strut for Office Chair,Bar Stool,Table 2. Stroke(mm): 80 ... : Black,Chrome 4. Standard: Class 2,Class3,Class 4 5. SGS BIFMA X5.1(100, 000 Times Testing) 6.Pressure ... Blue,Gray,Green 8. Warranty: 5 years 9. OEM Service10.ISO9001 Certificate. gas spring or gas cylinder for a variety of chairs