... Gas Lift,Spring,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 / Table2. Stroke(mm): 80 / 100 / 120 / 140 / 160 ... Class 3 / Class 4 5. SGS BIFMA X5.1(100,000 Times Testing)6, Pressure(N): 300--4507, Bottom ...