Boss Office Products B1646 Multi-Function LeatherPlus Drafting Stool with Adjustable Arms in Black Upholstered in Black LeatherPlus Back angle lock allows the back to lock throughout the angle range for perfect back support Seat tilt lock allows the seat to lock throughout the tilt range Pneumatic gas lift seat height adjustment; Adjsutable Arms Nylon base; 20" diameter chrome Footring; Hooded double wheel casters Upholstered In Black Leatherplus with adjustable arms and a 20" Diameter Chrome Footring Back Angle Lock Allows The Back To Lock Throughout The Angel Range For Perfect Back Support Seat Tilt Lock Allows The Seat To Lock Throughout The Tilt Range and Pneumatic Gas Lift Seat Height Adjustment 5 Star Nylon Base Allows Smooth Movement and Stability with Hooded Double Wheel Casters