SPACE Seating Professional R2 SpaceGrid Back Chair with Padded Memory Foam Eco Leather Seat, 2-to-1 Synchro Tilt Control, 4-Way Adjustable Flip Arms, and Platinum Finish Accents Managers Chair, Black Breathable R2 Space Grid Seat and Back with Adjustable Lumbar Support Pneumatic Seat Height Adjustment Deluxe 2-to-1 Synchrony Tilt Control with 4-Position Lock, Anti-Kickback, Seat Slider and Tilt Tension Control Platinum Finish Flip Up Arms.Assembly Required Heavy Duty Platinum Finish Base with Oversized Dual Wheel Carpet Casters and Black End Caps