1.Gas Lift,Spring,Cylinder,Strut for Chair,Table 2.Black,chrome Surface 3,SGS BIFMA 4,ISO9001 Certificate 5, ... / Gas Cylinder / Gas Strut for Office Chair / Bar Stool / Table2. Stroke(mm): 80 / 100 / 120 / 140 / 160 / 230 / 260 / 330,Etc ... .3. Surface: Black / Chrome4. Standard: Class 2 / Class 3 / Class 4 5. SGS BIFMA X5.1(100 ...