Triple solid rubber rings for even more chewing fun. The rings are very durable and great for dogs that love to carry something in their mouths. Recommended for teething puppies too. These 'Invincible' Chains provide great interactive fun for your and your dog! Use to fetch or tug, while helping to alleviate "doggie breath!" Assorted colors, please allow us to choose for you. Each link measures 6.25" in diameter. Imported.