extreme dog toy is a unique, thick, natural rubber ball for dogs. It's more challenging and thicker than our traditional Hol-ee Roller. It is designed for tough dogs and tough chewers. The Hol-ee Roller X has strategic patented honeycomb cutouts covering the ball so a dog can grab it and pick it up. It's also great for games of tug-of-war! The cutouts can also be quickly filled with a pet's favorite treats or small toys for long-lasting boredom-busting fun! All JW pet products are intelligently designed with our commitment to a fun first while providing quality, non-toxic pet toys. Ships are in assorted colors, either black or blue.