... Spring,Lift,Cylinder,Strut for Chair,Table 2.Black ,chrome Surface 3.SGS BIFMA 4.ISO9001 Certificate 5.OEM Service ... production same as your samples.ColorOuter tube color: Powder coating & Chrome Button color: White, Black, Orange, Green etc.ClassClass is ... Europe, South America, Middle East Asia etc.Our pursuit is Good Quality, Good Service, Long Term Cooperation.Welcome your inquiry anytime.