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.