Model number: T859A Size: Standard Chair Cover Material: Full Mesh Arm Type: Adjustable 3D Mechanism Type: Multi-functional tilt by weight Gas Lift: 80mm Base: R350mm Aluminum alloy Base Casters: 60mm Caster/PU Frame: metal Foam Type: None Adjustable Back Angle: 135° Adjustable Lumbar Cushion: No Adjustable Headrest: Yes