Boss Office Products B1690-CS Stand Up Caressoft Drafting Stool without Arms in Black Contoured back and seat help to relieve back-strain Pneumatic gas lift seat height adjustment. Back height is 16.5 inches Large 27" nylon base for greater stability. Seat depth is 18 inches Hooded double wheel casters; Strong 20" diameter chrome foot ring Optional glides can be used in place of casters (TU021) Contoured Back and Seat Help To Relieve Back-Strain Pneumatic Gas Lift Seat Height Adjustment Large 27" Nylon Base For Greater Stability with Hooded Double Wheel Casters and Strong 20" Diameter Chrome Foot Available In Four Fabric Colors and Black Cares soft Optional Glides Can Be Used In Place Of Casters (Tu021)