A unique thick 1% natural rubber ball for dogs. The JW Pet Hol-ee Roller X Ball Dog Toy is tougher and thicker than the hol-ee roller. This product is designed for tough dogs and tough chewers. The JW Pet Hol-ee Roller X Ball Dog Toy is intended so that the dog can grab it easily or else play tug-of-war. The JW Pet Hol-ee Roller X Ball Dog Toy is for Bad, Mad Dogs! This all natural rubber dog toy has square cut outs that can be filled with treats or small toys.