1.Gas Spring,Lift,Cylinder,Strut for Chair,Table 2.Black ,chrome Surface 3.SGS BIFMA 4.ISO9001 Certificate 5.OEM Service 1. Gas Spring / Gas Lift / Gas Cylinder / Gas Strut for Office Chair / Bar Stool / Table 2. Stroke(mm): 80 / 100 / 120 / 140 / 160 / 230 / 260 / 330,etc. 3. Surface: Black /Chrome 4. Standard: Class 2 / Class 3 / Class 4 5. SGS BIFMA X5.1(100,000 Times Testing) 6. Pressure(N): ...