Back frame/ Star base hub/ Star base leg/ Adjustment lever:Steel, Epoxy/polyester powder coatingBackrest cushion:Polyurethane foam 30 kg/cu.m.Core filling:Polyurethane foam 35 kg/cu.m.Cover plate/ Connector:Reinforced polyamide plasticKnob:Reinforced polypropylene plasticArmrest cushion:Polyurethane foam 52 kg/cu.m.Cover/ Cover plate:Polypropylene plasticSpring:SteelLeather:Through dyed grain leather from cattle, with a treated, embossed and pigmented surfaceFabric:100% polyester (min. 90% recycled)