Dimensions (mm): ( 655 (W) x 570 (D) x 923 - 1008 (H) ) Material : Upholstery Material: Mesh fabric Backrest: nylon with fiberglass content. Adjustable lumbar support Armrest: polyurethane padding armrest. Built in control mechanism for armrest height adjustable Seat pan: polypropylene shell. Firm support to the hip and pelvis Gas lift: pneumatic height adjustment standpipe. 100.000 cycle durability Base: 5 star nylon base completed with heavy duty castor wheels highly resistant zinc die cast