Chuckit! Fetch Medley Medium Dog Toy. The Chuckit! Fetch medley is designed for the most demanding use by fetch enthusiasts. With three times the fun, the small or medium sized balls are made from natural rubber, so they are easy to clean. The fun, high-quality interactive balls promote activities for canine fitness which will enhance the human-canine bond. Includes: Whistle Ball (designed with holes that twitter and whistle while the ball is in flight), Max Glow Ball ( has a bright, long lasting glow that charges quickly under any bright light), and a Rebounce Ball (contains recycled natural rubber, and has a high bounce). Size is 2.5" diameter and is compatible with the standard / medium ball launchers.