The fetch toy medley packs vary by size but both include the Fetch Whistler and Fetch Max Glow Ball. The Rebounce ball comes in the medium size pack and the Erratic ball comes in the small pack. No matter what size each ball is unique and will give you and your pup endless options of fun! Our recommendation of this item does not guarantee that it will be currently in stock. Please visit us today to learn more about the availability of this product.