High-performance ball for dogs featuring a hollow, mesh-like design. Helps facilitate breathing and airflow into your dog's lungs while running and fetching - a breathable alternative to standard tennis balls. Compatible with Chuckit Dog Ball Launchers. Can also be used as a treat toy for dog training by utilizing the openings to stuff dog treats inside. Also floats for water or pool play. Measures 2.5 inches in diameter and is best suited for dogs weighing 20 to 60 pounds. The ball should be small enough for your dog to carry, but large enough that the ball can't completely fit in their mouth. When in doubt, buy a size up