In addition to all of the same great features of the regular Liberty nail Liberty Cu horseshoe nails include Copper (Cu) Shield Technology. This technology provides much more protection than traditional horseshoe nails. Hoof wall, white line and sole are stronger and healthier when Liberty Cu nails are used on a daily basis. The Copper(Cu) Shield Technology is unique to Kerckhaert and Liberty Cu horseshoe nails. E-Slim are European style nails. These fit well in shoes like the Kerckhaert DF and SSP series that were made first for the European market but found their way into the American market, especially in the Hunter and Jumper discipline. Some farriers prefer to punch their hand made shoes for E-heads because of the symmetrical nature of the nail. There is also a feeling that an E-head nail has more strength because the shank comes out of the center of the head, with slightly more mass.