Office Star Big and Tall Deluxe Executive Chair with Mid Pivot Knee Tilt, Gunmetal Finish Base and Adjustable Arms Thick Padded Contour Seat and Back with Built-In Lumbar Support One Touch Pneumatic Seat Height Adjustment Locking Mid Pivot Knee Tilt Control with Adjustable Tilt Tension Rated for 400lbs Heavy Duty Gunmetal Finish Base with Oversized Dual Wheel Carpet Casters