With hexagonal core wires and silver-plated copper wrap wires, their loud and aggressive sound compliments their vibrant color All strings in the set are coated with a red-colored version of DR�s proprietary K3 coating Delivers longevity, more projection, fewer unwanted overtones, and outstanding clarity and articulation RED Colored Acoustic Guitar Strings: Light 12-54 12, 16, 24, 32, 42, 54