Model number: G200A Size:Standard Chair Cover Material:PU Leather/Mesh Fabric Arm Type : Adjustable 5D armrest Mechanism Type : Multi-functional tilt mechanism(any angle locking) Gas Lift: 85mm class 4 gas lift Base :R350mm Aluminum Base Casters : 65mm Caster/PU Frame: Aluminum and Nylon Foam Type: High Density Molded Foam Adjustable Back Angle :140°