Barkworthies grade-A, naturally shed elk antler burrs are dense, durable dog chews that will give your dog hours of chew time, beneficial vitamins and minerals as well as cleaner teeth! Our American-sourced, naturally-shed elk antlers come from the Rocky Mountains. After they're collected, they're simply washed, cut and packaged. We also round any sharp edges to make them extra safe for your dog. Barkworthies Elk Antlers are highly durable and are will last hours or days for even the most aggressive chewer. Each antler is filled with soft marrow and contain essential nutrients such as zinc, calcium, manganese and iron that your dog needs for a healthy, long life. Their tough, textured surface helps remove tartar and plaque while massaging the gums. Most Barkworthies' all-natural dog treats and chews are completely preservative-free and additive-free.