This chew set includes two Benebone shapes, a curved Wishbone and an angled Fishbone, both molded from durable nylon in the USA. The uneven, multi-pronged design lets a dog pin one end to the floor with a paw while gnawing the other end, since dogs cannot hold a straight bone steady on their own. Deep grooves run along each prong to increase surface area for scent and flavor. The chews are intended for gnawing and mental stimulation rather than for eating, so pieces should not be swallowed. Supervision during use is recommended, and either chew should be replaced once it shows cracks, flattened ends, or missing chunks. No assembly or setup is needed; both pieces are ready to hand to a dog straight out of the pack.