Self adjusting SpaceFlex Backrest Support System with Breathable Mesh Seat.One Touch Pneumatic Seat Height Adjustment.Self Adjusting 4 to 1 Synchro Tilt Control with 3 Position Lock and Anti-Kick Function.Locking Tilt Tension Adjustment Height.Adjustable Platinum Coated Arms with Soft PU Pads.Heavy Duty Platinum Coated Base with Black End Caps and Dual Wheel Carpet Casters.