For maximum accuracy and performance in your pitching machine, JUGS Sting-Free pratice balls will prove to be the best practice balls you"ve ever used. Jugs Sting-Free softballs have a one-year guarantee and are the same size and weight as a regulation softball. Designed for pitching machines, Sting-Free softballs feel like a real leather ball when hit and are waterproof making them ideal for indoor and outdoor use. Also great for offensive and defensive drills.