20" Pet Tennis Ball Launcher. Comes in two colours, Green and Blue. Excellent Dog Toy With Free Tennis Ball. 20" Long, Hassle-free exercise for you and your pet! These tennis ball throwers are a runaway success and no dog owner should be without one. Just put a tennis ball (Tennis Ball Included) in the end of the thrower and swing it, and the ball will be launched far further and easier than you could throw it by hand. Its ergonomic design makes it really easy to use. Your dog will love chasing after this popular dog toy and bringing it back to you. The Tennis Ball throwers are made from toughened plastic and come in a range of two colours. Keep your dog healthy and well-exercised with this amazing tennis ball thrower - one of the best dog toys around.