Puppy KONG Rubber Bone Toys are made of a natural rubber specially designed to exercise growing jaws and assist the teething process in puppies. Added cotton rope helps clean teeth and satisfies puppy's urge to chew. Recommended by Veterinarians for healthy teething, this toy will keep your puppy entertained for hours. Rubber Bone Measures 3.25 inches long and knotted rope measures about 12 inches long. This toy is recommended for x-small puppies (toy or teacup breeds).