1Air Spring,Gas Spring,Lift,Cylinder for Chair,Table 2.Black,chrome Surface 3, ... SGS BIFMA 4,ISO9001 Certificate 5,OEM Service 1.Gas Spring / Air Spring /Gas Lift Chair / Gas Cylinder / Gas Strut for Office ... / Black / Orange / Blue / Gray / Green8, Warranty/Gurrantee: 5 years9. Management System of our company:OEM Service 10.Certificate:ISO9001 Certificate,BIFMA ...