Rubber dog toy has crunchy bottle material inside. Makes soundsyour pooch will love! Certified non-toxic for your pet'ssafety. Durable rubber outside Dogs love the sound and feel of water bottles. But water bottleshave caps that come loose, sharp rings that can harm sensitivemouth areas. JW's patent pending bottle ball has the crackle sound andcrunchy feel without the water bottle issues. Advise for Use: Always supervise your pet at play with the toy. Remove the productif damaged or, if parts become separated for the safety of yourpet. Important: JW Pet toys have been tested by an independent facility for Lead, Antimony, Arsenic, Barium, Cadmium, Chromium, Mercury, Selenium, and determined to be safe.