The same natural rubber compound as your Traditional Kong®. Patented "chew clean" grooves perform a gentle "squeegee" action on teeth and gums when chewed. Kong® dog toys can be stuffed with your dog's favorite treats, dog biscuits, peanut butter, cheese, etc. for hours of exercise and chewing fun. While your dog tires to crunch up and lick out the "hidden treat," you are teaching him that chewing on a Kong is better than on the furniture. Recommended by Veterinarians, Trainers, Dog Professionals and Satisfied Customers Worldwide! Kong® Toys Clean Teeth and Condition the Gums!