National Public Seating 1100 Series Steel Frame Polyfold Fan Back Double Hinge Folding Chair with Triple Brace, 480 lbs Capacity, Black (Carton of 4) Folding chair with plastic seat and backrest and steel frame for temporary seating and efficient storage when not in use 18 gauge, 7/8" tubular steel frame supports 480 lb. static weight, 300 lb. drop weight "Y-frame" structure, three double-riveted leg cross braces, and double hinges on each side for stability Plastic seat supported by steel frame for strength Frame can be used as a handle to facilitate carrying