Model number:G235 Size:Standard Chair Cover Material: PU Leather Arm Type : Adjustable 2D Mechanism Type : Conventional Tilt Gas Lift: 80mm black gas lift Base: R350mm Nylon Base Casters : 60mm Racing Caster Frame: Metal Foam Type: High Density New Foam Adjustable Back Angle: 155° Adjustable Lumbar Cushion: Yes Adjustable Headrest: Yes