This TygerClaw mid back mesh office chair is ergonomic with multiple functions which provide maximum support, ease and comfort to the user. The seat height can be easily and effectively adjusted by pneumatic gas lift and 360-degree swivel wheels make this chair more flexible in the working space. Upholstered in soft and durable black PVC Built in lumbar support to maintain proper sitting posture Flexible adjustment for seat height, armrest width, seat depth and tilt tension control Heavy duty chromed steel base with durable multi-surface dual wheel casters Black superior PolyPropylene(PP) armrest for arm positioning Convenient pneumatic seat height adjustment Tilt Tension Function enables to control the smoothness of the Back rest Tilt/Recline and can be adjusted as per the weight of the person sitting on it Excellent for office, work station and cubical area 360 degree swivel wheel and chair can run smoothly on floor TygerClaw 21.5-in Black Mesh Office Chair