The Go-Frrr Ball Kit is a slingshot action fetch ball package. You can use it as a training tool or to give your dog a better workout, Go-Frrr Ball will help you exercise your dog more, and your arm less. The kit comes with an easy launcher and two large balls. Launch over and over and over without throwing, launches like a slingshot. Go-Frrr balls are fun, safe, non-toxic and they float in the water.