Base is made of plastic. Variants: light grey (RAL 7047); grey (RAL 7043) and beige (RAL 7036). Upholstery that meet the requirements of Möbelfakta such as EVO and SYNERGY are available. Plastic elements and the cover of the gas lift are made of different materials; therefore their colour might vary slightly.glides - standard - hard glides (for soft floors) - option - teflon gIides (universal) seat. Wooden frame flooded with cold molded polyurethane foam.