This is the multi-function drafting chair that is upholstered in black leather, 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. Besides the seat height adjustment function, it has a large 27″ large nylon base for sitting stability, double wheel casters, and strong 20″ diameter chrome foot ring for comfortable use.