This 15 foot bench has a back and seat made of 2x10 fiberglass planks built with reinforced construction. The frame is 2 3/8 inch O.D. galvanized tube and 1 1/16 inch cross brace and portable leg style. This bench is perfect for indoor or outdoor use at a park or in a stadium. Fiberglass benches are low maintenance, commercial quality, and long lasting benches.