Product Description Black Beauties electric guitar strings with K3 Technology. The K3 coating is the first coating that players report, "sound as good or better than uncoated strings." DR's remarkable and proprietary K3 Technology coating is the first coating that makes no apologies and no excuses for not delivering sound equal to uncoated strings. Players tell us that these strings have more volume, less unwanted overtones, greater clarity and articulation than standard, uncoated strings. Yet, they provide the same protection due to corrosion and perspiration as well as increased tone life that coated strings are known for. From the Manufacturer BLACK BEAUTIES™ Black Colored Electric Guitar Strings aren’t just about the sleek and sophisticated look. They feature a hexagonal core wire and a nickel-plated steel wrap wire to maintain brightness and feel. All strings in the set are coated with a jet-black version of DR’s K3™ ultra-hard coating, delivering longevity, more projection, fewer unwanted overtones, and outstanding clarity and articulation.