The Liberty Cu horseshoe nails are copper coated. These innovative nails are designed to eliminate micro-organisms that enter the hoof wall through the nail holes, helping prevent infection from developing. The copper surface kills bacteria as soon as it comes in contact with the nails and helps hooves remain strong and healthy throughout the shoeing cycle. No rust or wear inside the hoof wall. Consistent quality. Outstanding results. Material is optimum for clinching and great fit. Increased customer satisfaction. Ideal for all horses.