Constructed from precisely machined and hardened tool steel, each mandrel is laser etched with US sizes 1 to 16 in ¼-size increments. We purchased a large quantity of this 13” long high-quality ring mandrel so that we could offer it at a much better price than mandrels of similar quality. Each one is packaged in a high-density polyethylene telescoping plastic case. It’s an excellent value. see related products below Made in USA.