mefeir Modern Adjustable Hydraulic Executive Office Home Computer Task Ergonomic Desk Chair on Wheels 360&deg; Swivel Caster, Mid Back Leather SGS Certificated Working Rolling Stool SGS CERTIFICATED GAS LIFT  Use SGS approved hydraulic gas cylinder to ensure safety. Fit any home office conference libraries or reception areas, as ergonomic designer chair. NOISE FREE CASTER  Wheels are wrapped by PU to ensure that it will not make any noise when moving around. It is suitable for hardwood floor or carpet. STABLE IRON BASE  Five legs base made from sturdy iron and is galvanize, which has longer lifetime and is rust-proof. Measuring 19.6 in diameter, this chair can support up to 330LBS, keep balanced no matter how you roll around. ADJUSTABLE & ROTATABLE - The working chair is easy to adjust from 18.9 to 24.8, covering all different body sizes, ideally for adults and children. Both wheels and seat are able to can rotate 360 freely. LARGE SIZE  Upholstery seat is 18.1 wide 15.7 deep. Cushioned by 35D high quality sponge, makes you feel extremely comfortable when sitting.