This grey tweed drafting stool comes with an easily adjustable pneumatic gas lift seat height adjustment, to help you find the personalized sitting style that suits you and your work environment. The contoured back and seat can help relieve back strain through extended periods of work. The 20 inch diameter chrome foot ring provides added foot and leg support. The Euro-style nylon base provides greater stability to the stool by spreading the load over a larger surface area, and the heavy duty dual wheel casters make it easy to move and shift directions. The Loop Arms make for comfortable and natural arm rests.