This product comes with three separate exciting balls for fetch! The Chuck It Fetch Medley has the Whistler ball that whistles in flight, the Max Glow ball that glows in the dark, and the Rebounce ball made of recycled rubber to make it extra bouncy. Each toy by Canine Hardware is made of soft durable rubber that makes them easy to wash. So switch up your game of fetch with a variety of specialty balls. These three balls also work with the Chuck It Ball Launcher, sold separately. Size Medium.