DRAGON SKIN* Acoustic Guitar Strings feature DR’s K3* clear coating on a phosphor bronze wrap wire to prevent dirt and perspiration from reaching the hexagonal core wire, preventing corrosion. The K3* coating, which is applied to all strings in the set, is ultra-hard and doesn’t dampen vibration like softer coatings do. The strings have more projection, fewer unwanted overtones, greater clarity and articulation than uncoated strings.