Good stability, high safety and explosion protection. Made of stainless steel and ABS, providing excellent impact resistance, the solid construction is designed to resist corrosion, which is very durable. Suitable for general office chairs, bar stools, computer chairs. Features -Color: Black-Material: Stainless steel, ABS-Size: 39.00X5.00X5.00cm/ 15.33X1.97X1.97in -Note: The tube height of 120# is 22cm-Reinforced stainless steel lift rod, smooth and quiet lifting. Suitable for most office chairs.- Heavy duty gas spring cylinder can support enormous weight, high center point for chair support column.- The length of the chair cylinder can be extended to fit most of your office chairs, with reliable performance.- Superior performance, exquisite workmanship, safe and reliable. Easy to install without extra screws.- This gas spring is suitable for most executive chairs, task chairs, office chairs, rolling stools, drafting stools. Packing list: 1 x Gas Spring Cylinder