Model number: T809A Size:Standard Chair Cover Material:Mesh Arm Type : Adjustable 3D armrest(up&down, front&back, left&right) Mechanism Type: Multi-functional tilting mechanism with 3-level locking Gas Lift: 100mm TUV approved Base :R350mm Aluminum alloy Base Casters : 60mm Caster/PU Frame: PA Nylon Foam Type: High density Foam