Bionic Rubber is a revolutionary material that can withstand the aggressive play patterns of most pets. Bionic products have been tested in rescue shelters and day cares around the U.S. for years. By making and destroying countless samples, we know Bionic Rubber can hold up to the most aggressive chewers. 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.