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Rated 0 out of 5€8.95 – €21.20KONG Extreme is the most durable version of our original KONG toy. Theultra-strong, ultra-durable, black rubber compound is recommended for the most powerful chewers. Our super-bouncy, black natural rubber compound is unequaled for dogs who like to chew. Stuffing healthy treats into a KONG keeps dogs happily working and out of trouble for long periods of time.