Pelz bunker board, transforms almost any outdoor space into your own Private practice bunker. Learn exactly how good sand shots look and feel, so you can repeat them from any bunker situation. The bunker board is designed with a concave hitting surface that helps golfers learn to swing through sand shots without the "digging" or "deceleration" that cause poor results from sand. Reinforces the proper motion and "feel through impact" for well-played sand shots. Fully assembled-just add sand and it is ready to use.