The Extreme version of the original Kong Ball, this toy is made for those dogs that are particularly strong chewers. Made with the most durable rubber on the market, this ball is specifically for the dog that loves to chew, chase, fetch and play! Available in 2 sizes – Small and Large. Note the Kong Extreme Balls in Small is equipped with a hole for stuffing full of your dogs favourite treats and the large isalso designed with a hole for safety purposes.