Computer Chair factory For comfortable task chair, mesh back provides support and breathability.Pneumatic seat height adjustment; Upholstered seats are 2 inches thick for added comfort.It has a maximum bearing capacity of 150 pounds.Smooth rolling casters with assembly instructions included. BIFMA certifications Item No. W-20-1W Material Mesh + PP Armrest N/A Mechanism Lifting mechanism Gaslift 120mm gaslift, class 2 Base 270mm black nylon base Castors Black PA Packing Size 53*22.5*53CM QTY/CTN 1 N.W/G.W 6.6/7.8KGS Loading QTY/40HQ 1120PCS Computer Chair factory website:http://www.herui-chairs.com/office-chair/computer-chair/