Antler's Unlimited Antler Dog Chew Treats are made from a natural material that is rich in minerals, does not splinter and comes from a completely renewable source: Deer Antlers! Wild deer shed their antlers once a year as part of a natural process, after which the deer re-grow another set. The shed antlers are gathered and transported to the manufacturing facility where they are cut and cleaned. Antlers hold up substantially longer than most traditional chews made from plastic, bone, or compacted starch. A minerals analysis of Antlerz show high concentrations of calcium and phosphorus, with trace amounts iron, zinc, and sodium. Unlike processed livestock bones Antlers dont chip or splinter when they are being used by even the most aggressive chewing dogs. A dog's chewing action grinds Antlers down slowly. Antlers are a 100% natural, mineral rich dog chew that contains no plastics, no petrochemicals, no empty starches or artificial flavors. Antlers are not a by-product generated by a meat processing facility or slaughter house. Size refers to girth, not length. Antlerz are approximately 4 inches long. Small are slender, large are thicker. Made in the USA.