Boss Office Products B1690-BK Stand Up Fabric Drafting Stool without Arms in Black Contoured back and seat help to relieve back-strain Pneumatic gas lift seat height adjustment Large 27" nylon base for greater stability Hooded double wheel casters; Strong 20" diameter chrome foot ring Optional glides can be used in place of casters (TU021) Weight capacity is 250 lbs. Ships ready to assemble