Features:

• The ultra-strong, black rubber compound is recommended for power chewers. Supervised use is strongly recommended for power chewers.
• Perfect for stuffing with KONG Treats and ZIGGIES.
• Used worldwide by police, drug enforcement and military K-9 teams, as well as Schutzhund and AKC competition trainers.
• Please see chart for proper size and rubber formula.
• Made in the USA with Natural Rubber

Editor Reviews:

Product Description:
Fitness and fun for dogs. Exercises every muscle and reflex, nose to tail. Made of Ultra Flex, a puncture resistant, natural rubber, unmatched for strength, durability, and bounce. Non-toxic and non-splintering. The Tuffy fulfills the needs of typical small, medium, and large size dogs. Use the original "black" for aggressive chewers. Use more than one size for variation and therapy. This kong is 4" long. The Ultra King Kong (#80477) is 6" long.

Amazon.com Review:
Used by police, drug enforcement teams, and the military for training working dogs, this super-tough toy stands up to jaws of steel. Even if your dog's job rarely takes him off the couch, the Kong Extreme's goofy, unpredictable bounce makes for hours of chasing and fetching fun--just the thing for animals whose life in the wild consists of tracking, killing, chewing, and then doing the same thing all over again. When you're away, simply stuff the hollow interior with treats or gooey peanut butter, and extracting the contents becomes a "hunt" to keep any pooch happy and busy all workday long. Chewing Kongs helps promote strong jaws, clean teeth, and general oral health. Even aggressive "power chewers" will find it hard to bite through carbon-formula Ultra Flex, and dogs with separation anxiety or problem behaviors like barking and digging will especially benefit from the mental and physical stimulation.

Kongs are made in the USA from a thick, flexible rubber that's non-toxic, non-splintering, and puncture-resistant. This black Kong Extreme is appropriate for medium- to large-sized aggressive chewers, including smaller Labs and golden retrievers. Supervised play is highly recommended, especially when first giving a Kong toy to your dog. Regularly inspect the Kong for cracks or missing chunks, and replace worn or damaged toys to avoid a choking hazard. Satisfaction is guaranteed; if either you or your dog aren't happy with your purchase, return within 30 days for a full refund. --Mary Park

Rating : - Review of XL Kong
An appropriately sized Kong is a must have for any dog owner. Our dog differentiates her Kong by name and carries it from her crate to the kitchen for reloading in the morning. The Extreme XL is perfect for our smaller lab (65lbs) and it holds about a half cup of food. When she was about 1 she was able to chew the edge of the opening off, we replaced that one 3 months ago and the new one is fine so far.

Good luck