The Precision Square 4in offers a challenge to any shooter. The 4in Paddle flashes up and resets with a good shot. The Square measures 8in. Both the Square and Paddle are made of 3/8in AR500 Rifle Rated Steel. The Paddle system is made of high grade steel. This is a complete system including Square, Paddle, and Welded Base. All the shooter provides is a 2x4 of lumber.