The Chuckit! Is one sweet way to exercise your dog without wearing out your arm. 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. Use it in the park, in your backyard, or anywhere else with plenty of room. With a little practice you can consistently throw the ball 100 to 140 ft.