Canine Hardware Chuckit - is a great way to exercise your dog...without wearing out your arm. With the Chuckit you can throw that ball out of the ballpark over and over again. Use it in the park, in your backyard, or anywhere there is plenty of room. With a little practice you can consistently throw the ball 100 or more feet. Made of lightweight, durable plastic, the Chuckit uses a standard-size tennis ball and is designed for hands-free pickup... so you NEVER have to bend down and pick up a slimy ball again.