... cylinder for office chair 1.Pass SGS test 2.100000 times fatigue test 3.Surface:Black,Chrome 4.free sample ... 1.Gas Lift,Gas Spring ,Gas Cylinder,Gas Strut for Office Chair,Bar Stool, ... 160,230,260,3303. Surface: Black,Chrome 4. Standard: Class 2,Class3,Class 4 5. SGS BIFMA X5.1(100, 000 ... ISO9001 Certificate. gas spring or gas cylinder for Office Chair and bar chair