15 foot bench without back has seat of 2x10 planks fiberglass, built with reinforcing core type construction. Frame is 2 3/8 inch O.D. galvanized tube and 1 1/16 inch cross brace and portable leg style to allow for mobility. This bench is perfect for indoor or outdoor use and great for parks, locker rooms, ball diamonds, soccer fields, etc. To guard against up ending or tipping, end overhang is only 6 inch.