Put a piece of sheet metal atop this Air Capital 12in. Leather Shot Bag and use a mallet to form metal into the desired shape. As the bag yields with each blow, you shape and stretch the metal for RV, aircraft and other projects. Made of top grain cowhide, the 12in. diameter bag has a 1 3/4in. center riser that allows you to effectively use the entire diameter. Material: Leather, Product Type: Shot Bag Made of top grain cowhideFill not included