We care about your voice. We'd love to hear from you. The stool chair is an improved Boss Office Products’ basic stool, with contemporary stereo twin-line stitched cushion, adjustment lever, silver cap and polished wheel covers. The structure is robust and durable. SGS certificated gas cylinder goes up and down smoothly; Chrome covered castors move easily over wooden floor and carpet; chrome rather than nylon base is strong and sturdy. Besides, we have upgraded: 1. Shorten the assembly steps and update the assembly instruction to make the assembly easier. 2. The star base is larger with the diameter from 18.9" to 21.5" to make the stool safer and stabler.