Chuckit! Fetch Medley Ball Set Dog ToysReady, set, fetch! Give your dog something to jump for. Your dog will love this grippable rubber ball set made just the right size to use with your Chuckit! Ball Launcher, sold separately. Fetch Medley set includes three of our favorite balls: the Chuckit! Whistler Ball, Chuckit! Max Glow Rubber Ball & Chuckit! Rebounce Ball or Chuckit! Erratic Rubber BallChuckit! Whistler Ball is a high bouncing rubber ball that has four holes in it that produce a whistle as air passes through. Chuckit! Max Glow Rubber Ball is a durable rubber ball that glows in the dark to allow the game to keep going when the sun goes down. No batteries needed. The Chuckit! Max Glow Rubber Ball charges quickly under any bright light. Chuckit! Rebounce Ball has an environmentally friendly design that utilizes recycled natural rubber, and the Chuckit! Erratic Ball never bounces the same way twice!