DESIGNED FOR DURABILITY,Our designers took years perfecting this bone! Careful attention was made to ensure it fits naturally in the curvature of the canine mouth. The ridges across the top give your dog the feeling that they are chewing through the toy _ keeping them interested in it for months! Its unique interior shape provides strength for even the most aggressive chewers._FULL OF FUN,The opening on our bone is designed to be the perfect place to put treats, dog bones and peanut butter. When you're dog is done, simply throw the toy in the dishwasher for easy cleaning! __DESIGNED FOR BIONIC PLAY. GUARANTEED.Our proprietary "Bionic Rubber©" material ensures that your dog will enjoy playing with the Bionic Ball for a long time.