These teething rings are specially formulated with DHA and calcium to give your furry young friend a healthy start. They are also designed to meet the specific chewing needs of puppies. The flexible and pliable design is perfect for puppy's delicate gums and new teeth. N-Bone puppy teething rings are healthy dog treats that are a functional, edible, and highly digestible dog treat for puppies. These teething rings are free of rubber, nylon, or plastic.