A ball is just a ball? Nope not anymore with Pet Qwerks® Jingle X-Tire Balls! Available in two sizes X-Tire Balls are made with a pair of small tires ruggedly molded together into a single ball with a hollow center that holds a whopper-sized chrome bell that jingles as your dog shakes tosses rolls retrieves and flings the ball. The unique design and shape make it easy for your pet to pick up and have fun rolling action.