Frame in chromed steel or in solid oak for “wood versions”, natural or coffee. Seat filled with flame retardant polyurethane foam and Dacron. Chairs 050, 0BW,0BX and 0BY are an injection moulded polyurethane foam with inner steel structure. Flame retardant. Chairs 0BW and 0BY have arm in steel covered with polyurethane. No removable covers.