Model number: Q-2019 Size:Standard Chair Cover Material:Mesh Arm Type : Adjustable 3D armrest(up&down, front&back, left&right) Mechanism Type: Multi-functional tilting mechanism by weight Gas Lift: 100mm class 3 Base :R340mm Nylon Base Casters : 60mm Caster/PU Frame: PA Nylon Foam Type: molded Foam