Durable Dog Chew Toys are made with non toxic, pet safe rubber. Thermal plastic rubber (TPR) is a unique type of material that is soft to touch but very durable. These toys are able to handle large temperature extremes, with temperature ratings from -40 degrees to 158 degrees F, making them dishwasher safe and easy to wash and keep clean. These toys are designed specifically for puppies, adults and senior dogs using different grades of TPR. Perfect for teething puppies or adult dogs in need of exercise or to help alleviate boredom or for senior dogs that can no longer chew hard rubber toys.