Nylabone PuppyChew Teething Rings encourage non-destructive chewing habits right from the start. They're made from durable interlocking nylon rings to satisfy the chewing instinct of powerful puppy chewers. Small bristle-like protrusions are formed during chewing to help clean teeth, prevent plaque and tartar build-up. Veterinarian recommended! The colorful and fun shapes are sure to appeal to your puppy. Ideal for puppies weighing up to 15 pounds.