Nylabone Puppy Chew Teething Rings are specially designed for teething puppies up to 11kg. Made from an inert soft thermoplastic polymer, they help satisfy the chewing instinct while also encouraging non-destructive chewing and cleaning teeth. The bristles raised during chewing will help prevent tartar build-up, making these rings a great choice for your pup's oral health. Note: Not recommended for adult dogs or puppies with any permanent teeth.