Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus Tough Nylon Tri-Bone toy is made of durable ballistic nylon material. This toy is sure to entertain you and your K9 for hours. Perfect for game of interactive fetch and retrieve. Floats for added fun. The K9 Fitness nylon toy collection will surely bring an end to your dogs’ couch potato days. A game of fetch gives them something enjoyable and constructive to do with their energy. Meanwhile, the soft nylon material makes it easy to pick-up and shake and is gentle on teeth and gums.