BLACK BEAUTIES? Black Colored Bass Strings aren?t just about the sleek and sophisticated look. They feature a round core wire and a stainless-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. K3? Coated applied to the wrap wire is extra hard to maintain string brightness while extending life The coating eliminates unwanted overtones, helping projection, clarity and articulation The all-black color creates a modern, sophisticated and distinctive look