Frame: Cast aluminum Finish: Brushed aluminum titanium finish. Lumbar support: Structure shapes the back to form a natural lumbar support. Base: 5-star base with dual wheel casters. Mechanism: Offset recline pivot with central tension adjustment. Tilt: Side-mounted lock lever. Height adjustment: Side mounted pneumatic seat height adjustment. (4”) Upholstery: Monza Graphite Black leather over mesh suspension. Durability: Textile durability for seat and back mesh Dimensions: Width (at arms) 22.75”, (between arms) 20”; seat height 17”-21”; seat depth 18”; seat to top of back 18.5”.