The crackle heads cuz medium toy is our iconic cuz with crackle heads technology inside. Our patent pending bottle ball is placed inside the natural rubber cage to provide the crackle sound and feel that dogs love. The tough outer rubber molds around the bottle ball providing a protective layer that will hold up to rugged play. The bottle ball has no cap or sharp rings that can harm soft mouth areas. Crunchy and safe fun that dogs love wrapped into a classic proven top seller. Suitable for medium breeds.