You can stack the chairs, so they take less space when you're not using them. This chair has been tested for home use and meets the requirements for durability and safety, set forth in the following standards: EN 12520 and EN 1022. Only recommended for indoor use. To prevent surface scratches and the sound of chair legs scraping on the floor, complete with FIXA self-adhesive floor protectors, sold separately. Designer Marcus Arvonen Leg frame/ Cross rail: Steel, Epoxy/polyester powder coating Seat/ Backrest: Polypropylene plastic Wipe dry with a clean cloth. Clean: With a mild soapy solution. For maximum quality, re-tighten the screws when necessary.