The Camillus Catapult Slingshot is made for rugged use and has intelligent design. Features include: folding arms for compact transportation, an ergonomic handle with a storage compartment, a firestarter / whistle, plus a compass. The heavy duty powerband is replaceable. The Camillus slingshot comes with four (4) .5" carbon steel ammo balls that are in the storage compartment of the handle. This is one of the best slingshots available. Additional ammo is available #19186. Lifetime Warranty.