Rubber with crunchy bottle material inside. Intelligent ideas. Happy pets. Crunch me! As with any pet toy, always supervise your pet while playing. Remove toy if damaged or if parts become separated, as injury could result. Dogs love the sound and feel of water bottle. But water bottles have caps that come loose, sharp rings that are left in place and ridges that can harm sensitive mouth areas. JW’s patent pending bottle ball provides the crackle sound and crunchy feel that dogs love without the issues of water. JW’s Crackle Heads line which includes rubber, plush and canvas toys, will provide your pup with loads of fun! Dogs love to play with water bottlers! Crackle Heads toys from JW Pet have specially designed balls made from water bottle material in every toy. Durable rubber outside + Crunchy water bottle material inside. Hours of fun! Certified Non-Toxic: JW Pet toys have been tested by an independent facility for lead, antimony, arsenic, barium, cadmium, chromium, mercury, selenium and determined to be safe. Visit us at www.JWPet.com. Bottle Ball is 100% recyclable. Made in China.