The Dura Chews are specifically made for powerful chewers and are made of durable nylon, with flavor impregnated throughout! And, because small bristle-like projections will be raised when your dog chews, it will help to clean his teeth and massage his gums too! Nylabone Healthy Edibles are edible and digestible, providing an alternative to traditional rawhide. These all natural gourmet health chews contain no plastic and no added salt or sugar. With a baked-in flavor from age-old Nylabone recipes, these chews are irresistible to dogs!