This 6 foot bench with back is made of 2 3/8 inch O.D. galvanized tube with 1 1/16 inch cross brace and portable leg style to allow for mobility. The seat and back is made of 2x10 planks of recycled plastic reinforced with steel ribs. These benches are perfect for indoor or outdoor use. Recycled plastic is heavy duty and lasts for years in a commercial environment.