It is a durable yet economical bench that is suitable for indoor or outdoor use. The brown frame is molded from high density polyethylene with ultra-violet inhibitors. Slots going all the way through the ends allow five 2 x 4 x 6 inch or shorter slats to be pushed in. No bolts or screws required. If you want to discourage portability, sand, or concrete may be poured into the frame to add weight.