The ultra-strong, ultra-durable, black rubber compound is recommended for the most powerful chewers. Features:Perfect for Stuffing with KONG Stuff"N treatsHelp to reduce boredom and separation anxiety for powerful chewersUnpredictable bounce for games of fetchUsed worldwide by police, drug enforcement, and military K-9 teamsAlso used by Schutzhund and AKC competition trainersMade in USA