For extreme play fun - The KONG® Extreme Ball dog toy is a specially developed, extremely robust play ball that has excellent bounce. Made of black KONG® natural rubber, the KONG® Extreme Ball is resistant to any punctures and offers long-lasting fun. So nothing stands in the way of an extensive game of ball. 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.