Frame: 100% Polypropylene and ABS polymer materials. Features a steel seat bar and lock-tight design that ensures customer safety and stability. Seat: The 1/8” padded seat platform is composed of Polypropylene to prevent wrapping of the seat pad. The padding is high-density 5/8” foam offering a higher level of comfort. Our Resin folding chair can be stocked over 30 chairs high. *5pcs chairs per box，12lbs per chair