like police K9 teams, drug enforcement and military K9 teams, AKC competition trainers, Shutzhund Clubs and more. Puncture resistant Super bouncy, and chewer friendly. Resilient, durable, and bouncy. Satisfies a dog's natural need to chew Cleans teeth and conditions gums. Thick, flexible walls that keep springing back for more Nontoxic, nonabrasive, non splintering, and does not get sharp when chewed. Recommended by veterinarians, trainers, dog professionals and satisfied customers world wide.