You and your dog will spend hours of fun together in the park with this variety of Medium Balls from Chuckit! The variety pack includes: 1 Glow-in-the-dark Max Glow Ball, 1 Whistler Ball, and 1 Recycled Rebounce Ball. Made from high-bounce rubber that makes it great for pools and lakes as well! Designed in the USA with high quality standards. Medium Balls measure 2.5 inches in diameter.