Back fabric:56% nylon, 44% elastic polyesterBase fabric:55% elastic polyester, 45% nylonSeat frame/ Backrest frame/ Support rail/ Gas cylinder:Steel, Epoxy/polyester powder coatingCover plate:Polypropylene plastic, Polypropylene plasticLumbar support:Polypropylene plasticTop frame:Polyamide plasticSlide rail/ Lock mechanism:SteelArmrest frame/ Star base:Aluminium, Epoxy/polyester powder coatingCover:Reinforced polyamide plasticCover:Synthetic rubberComfort filling:100% polyesterBase:Polypropylene plastic, Synthetic rubber