Our Turf Top is the quarter round design. Meaning that it is a quarter of a circle. Two sections back to back would make half a circle. The 12ft Turf Top has an actual length of 11-1/2ft, in order to fit between our standards. The frame of our Turf Tops are made of exterior grade wood, topped with plywood. The plywood is topped with green Asto-Turf. We cut holes in the ends for handles and easy transport. We keep the amount of wood, on the ground, to a minimum to help reduce ground/rot exposure. As with all of our jumps, we do recommend protecting your jump with a stain or paint treatment.