The KONG Classic has been the gold standard of dog toys for over thirty years. The super-bouncy, red natural rubber is perfect for average chewers. Stuff your KONG toy with KONG Ziggies, Snacks or Easy Treat paste to keep your dog occupied for hours. Satisfaction guaranteed. The Classic KONG's exclusive red natural rubber is puncture resistant, super bouncy, and perfect for typical chewers. It is made of medium/hard rubber and is recommended for most adult dogs. KONG toys are enthusiastically used and recommended by veterinarians, trainers, dog professionals and satisfied customers worldwide.