The KONG® Extreme Ring is made of especially durable natural rubber and perfectly stimulates and satisfies your dog's chewing instinct. Thanks to the robust material, they can bite to their heart's content; the large number of pimples guarantees plenty of variety. The toy's design also promotes healthy teeth and gums. Note: Please never leave the pet unattended while playing. No toy is indestructible. To prevent injuries, the toy should be checked regularly for damage or loose parts and replaced if necessary.