Steel: Grinded stainless steel 304 Galvanized steel, powder coated (Qualisteelcoat certificate) according to RAL colour standard Corten steel Wood: Exotic IROKO wood finished with colored/colorless oil Hard, varnished wood (eg. Brazilian oak or exotic TAUARI) - only indoors Kebony wood Concrete: Smooth concrete (light grey color) Other: Polycarbonate Polyethylene HPL