... ,Cylinder for Chair,Table 2.Black,chrome Surface 3,SGS BIFMA 4,ISO9001 Certificate 5,OEM Service 1.Gas Spring / Air Spring ... : Black / Chrome4. Standard: Class 2 / Class 3 / Class 4 5. SGS BIFMA X5.1(100,000 Times Testing)6, Pressure(N ... : 5 years9. Management System of our company:OEM Service 10.Certificate:ISO9001 Certificate,BIFMA,SGS