... spring or cylinder for Various chairs 1.Pass SGS test 2.100000 times fatigue test 3.Surface:Black,Chrome 4.free ... ,Gas Cylinder,Gas Strut for Office Chair,Bar Stool,Table 2. Stroke(mm): 80,100,120,140,160,230,260,3303. Surface ... : Black,Chrome 4. Standard: Class 2,Class3,Class 4 5. SGS BIFMA X5.1(100, 000 ...