Designed for the most demanding use by fetch enthusiasts, the Chuckit! Erratic Balls are not ordinary balls for dogs. The Erratic Ball is designed to fit in all Chuckit Medium Ball Launchers and will entice your dog with a crazy erratic bounce. Made from natural rubber, Chuckit balls are easy to clean and designed to stimulate your dog so they concentrate on positive play. Features: Quality Material used for your pet's best health Designed in the USA with high standards set Stimulating random bounce Easy to clean, natural rubber Medium balls measure 6cm diameter and suit small to medium dogs!