KONG Extreme represents the most durable version of our original KONG toy. The ultra-strong, ultra-durable, black rubber compound is recommended for the most powerful chewers. Perfect for stuffing with KONG treats Helps reduce boredom and separation anxiety for powerful chewers Unpredictable bounce for games of fetch Used worldwide by police, drug enforcement and military K-9 teams Also used by Schutzhund and AKC competition trainers Made in USA from Globally Sourced Materials Available in five sizes: S, M, L, XL and XXL