Let your pup choose the perfect ball for fetch with Chuckit!'s Fetch Medley. This set includes a Glowing Ball for night time play, a Whistler ball for catching their attention, and a Rebounce ball for higher bouncing fun. All sized medium and compatible with Chuckit! Launchers. Make fetch happen anywhere, anytime with Chuckit!'s Fetch Medley. Make fetch happen, day or night, with Chuckit!'s Fetch Medley. Featuring a glowing ball for nighttime play, a whistler ball for added excitement, and a rebounce ball for extra bouncing fun, this set will keep your pup entertained for hours. And with medium-sized balls compatible with Chuckit! Launchers, you can take the fun with you wherever you and your pup go.