A tennis ball that beeps! Kong has taken two classic toys and combined them into a lovely squeaky ball. The tennis ball is made of a non-toxic fabric that does not rub on the dog's teeth. The beeping parts are hidden inside the shell for the dog's safety. The tennis ball is available in five sizes: XS: 4 cm S: 5 cm M: 6 cm (same size as a regular tennis ball) L: 8 cm XL: 10 cm