"Shell in plastic composition with up to 25% wood fibers. The sled base is made of Powder lacquered steel. Wood fiber and the plastic mixture are injected into the mold and form the chair's shell. Wood base is cut from solid Oak wood and water-lacquered. Only for colored Dark Brown version: Note that there may be small color variations due to the inherent properties of the material. Clean with a damp cloth. If necessary, use a little dishwashing detergent on the cloth. leather cover: Clean the leather with a dry cloth regularly.Treat the leather at least four times a year using only special leather treatment products for aniline leather.Both versions with PU lacquer and water-based lacquer of this product can be cleaned with alcohol-based disinfectant. patina, where the surface color may fade a little.If the cleaning is uneven, this may become even more apparent, but the varnish remains on p lads. For wood products in lighter colors, the patina will be less visible. "