The Spud-Stud Plus potato nail reduces cooking time and saves energy. It can also be used on other foods. The Spud-Stud Plus works by transferring heat directly to the center of food and allowing moisture to be released from deep inside the potato. The Spud-Stud Plus is proudly made and packaged in the U.S.A. and is made from 100% safe, food grade stainless steel. Many similar products are made out of aluminum and many experts question the safety of cooking with aluminum due to potential adverse health effects. The Spud-Stud Plus is 8 inches long which allows enough metal to be outside of the food for maximum effectiveness. Competing products that are shorter can't work as well. Contains 4 Spud-Stud plus potato nails and a reusable storage tube.