Features: Gas Cylinder --140mm standard iron electroplate finished. Base --Polish Aluminum alloy Castors --Imported plastic carpet castor, No noisy when moving. Colors --Many colors for selection. The color will be sent randomly, if you want to choose the color, please leave us a message. Backerst --Available in PU Foaming or Micro fiber leather. --Two-way adjustable backrest, Allows vertical alignment for proper lumbar support and dynamic horizontal adjustment. --Plastic plate fit on the back of backrest to make sure the chair more durable and safety. Seating(Upholstery) --Available in PU Foaming or Micro fiber leather --High resistant foam inside and plastic plate underneath, ensures the seat cushion more comfortable and durable. --Height adjustable --3 adjustment levers underneath the seating, all designed for cleanability.