Nature's Own USA Smoked Marrow Bone are smoked in the time honored process using natural wood smokers, not in a chemical process used by the competitive brands. Nature's Own Pet Chews' Smoked Bones come from free range cattle which are USDA inspected and certified. They are a great treat for big and small dogs who obtain enjoyment from chewing. The treats are smoked and packaged in Michigan facilities. Doing things the right way, takes a little more time, but we think your pet's worth it! Hormone and pesticide free, with no added antibiotics. Sizes and shape of product listed may vary due to natural product variations.