This is the multi-function drafting chair that is upholstered in black fabric, it has the ergonomic features of back angle lock to lock the back throughout the angle range to get perfect back support. It also features the seat tilt lock to allow the seat to be locked throughout the tile range. Beside the seat height adjustment function, it has large 27" large nylon base for sitting stability, double wheel casters, and strong 20" diameter chrome footring for comfortable use. Dimension Seat Height: 26"-29.5"H Seat Size: 19.5"W X 17.5"W Overall: 27"W X 35.5"D X 43.5"-48"H Weight Capacity: 250lbs.