You'll never throw your arm out playing fetch with your dog when you use the Chuckit! Just place the ball claw over a tennis ball and press down firmly. The Chuckit! will grip the ball and automatically release it at the peak of your forward arm motion. With a little practice you can consistently fling the ball 100 to 140 feet. It's designed for hands-free pickup, so you won't have to bend over and touch another slimy ball. Made of lightweight, durable plastic, it is 26" long. One ball is included.