For the 1 Inch Reclaimed, Jasper Morrison designed a one-piece mono-block stackable chair, that is useful and durable, engineered to meet the demands of high use environments, and suitable for both indoor and outdoor use in eight colors. Made with 90% industrial waste material consisting of 88% waste polypropylene and 2% waste wood fiber. The 1 Inch Reclaimed Chairs are made of 90% reclaimed post-industrial waste - polypropylene and wood fibers. Therefore slight differences in chair surfaces may occur. To keep your chairs looking beautiful, clean with soap and water and dry with a soft cloth. Bleach may also be used, as well as hydrogen peroxide based cleaners (dilution level 1:10). Wash any film or residue with hot water. Alcohol based cleaners may appear to whiten the reclaimed polypropylene material. Should this occur, Emeco recommends wiping it down with a lubricant such as WD-40 to remove any residue and restore the surface.