Wickedbone is designed as a smart and interactive toy for dogs and their parents, as they can play together by driving the bone through the app. The tires of Wickedbone are made of TPU, and the body is made of polycarbonate. So it is resistant to chewing, but does not withstand too much under the jaws of power chewers. Please keep a close watch on your dogs in case they intend to destroy the toy or try to swallow pieces.