... coating are available 3,with high quality and best price Gas spring for furnitureItem: HY-C330-1Its stroke length is 225mm.Out tube ... it's Extended)With a circle in the middle of gas spring. 1,Material: Steel2,Quality: Airproof and durable3,Chrome or Powder ... ,Function: It would be adjustable and extendable by force7,Our gas spring get the certificate of TUV, SGS, LGA, CATAS.