The KONG® AIRDOG KNOBBY BALL combines two classic dog toys - the tennis ball and the squeaker - into one perfect fetch toy in a unique shape that bounces unpredictably for lots of healthy fun that satisfies instincts. The non-abrasive, high-quality material is gentle on teeth and gums. The squeaker provides lasting motivation and lots of healthy exercise. Note: Please never leave the animal unattended while playing. No toy is indestructible. To prevent injuries, the toy should be checked regularly for damage or loose parts and replaced if necessary.