Breathable R2 SpaceGrid Back with Adjustable Lumber Support.Thick Padded Black Mesh Seat.Pneumatic Seat Height Adjustment .Self Adjusting Mechanism.Adjusts Tilt Tension by Using your Body Weight as a Counter-Balance Resulting in Perfect Balance as you Recline.Mechanism also Features Backrest Lock and Anti-Kickback.Platinum Coated Padded Flip Arms with PU Pads.Heavy Duty Platinum Coasted Base with Black End Caps Oversized Dual Wheel Carpet Casters.