RED DEVILS™ RED DEVILS™ Red Colored Electric Guitar Strings aren’t for the timid. With hexagonal core wires and silver-plated steel 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, which delivers longevity, more projection, fewer unwanted overtones, and outstanding clarity and articulation.