"KONG Extreme represents the most durable version of the original KONG toy. The ultra-strong, ultra-durable, black rubber compound is recommended for the most powerful chewers.
Perfect for stuffing with KONG Stuff'N treats
Help to reduce boredom and separation anxiety for powerful chewers
Unpredictable bounce for games of fetch
Chewing cleans the teeth and massages the gums
Used worldwide by police, drug enforcement, and military K-9 teams
Available in five sizes: Small (dogs up to 9kg), Medium (7-16kg), Large (13-30kg), X-Large (27-41kg), and King/XXL (over 38kg)."