The Hol-ee Mol-ee Extreme Dog Toy is the TOUGH, rubber ball made to stand up to rough and tough dogs. Made from 100% natural rubber. For mad bad dogs! These tough rubber toys were developed for and by pet owners in order to provide a superior outlet for interactive fun between dog and owner, as well as for the play and exercise of the dog by itself. Pliable, resilient natural rubber has proven itself to be the best material to satisfy the dogs normal craving to chew.