... Lift,Spring,Cylinder,Strut for Chair,Table 2.Black,chrome Surface 3,SGS BIFMA 4,ISO9001 Certificate 5,OEM Service Products NameGas ... spring/gas lift/gas cylinder/gas strutUseUsed for boss chair/ office chair/bar chair etc ... to send your inquiry and vist to our factory anytime chair gas cylinder (TUV ,SGS ,ISO9001)