This contour bench frame only is designed for indoor or outdoor use. The contoured supports are 3/8 x 4 inch rolled steel that is formed to shape a smooth comfortable seat and backrest. The steel leg consists of a 2 1/2 inch square support tube welded to an arched 3/8 x 4 inch formed steel base. The entire frame is coated black for long life and good appearance. This frame is specifically designed so it can be fitted with your choice of 2 x 4, 3 x 4 or 4 x 4 nominal wood or recycled plastic slats.