such as police K9 teams, drug enforcement and military K9 teams, AKC competition trainers, Shutzhund clubs and more. Puncture proof, super bouncy and chew friendly. Resilient, durable and bouncy. Satisfies a dog's natural need to chew, cleans teeth and cares for gums. Thick, flexible walls that are more non-toxic, non-abrasive, does not chip or become sharp when chewing. Recommended by vets, trainers, dog professionals and satisfied customers worldwide.