DR Strings BLACK BEAUTIES Bass Guitar Strings BKB-40 About this item It offers bass players a superior black coated string without sacrificing the crisp tone clarity BLACK BEAUTIES colored bass strings combine the musical benefits of a round core design with the protection of DRs proprietary K3 coating. Formulated in Jet Black the coating has a sleek and sophisticated look while also providing extra-long life to your strings. A round core wire and stainless-steel wrap give Black Beauties full tone and balanced harmonic response along with the playability that is one of DRs signatures. The hard coating also ensures outstanding clarity and articulation by reducing unwanted overtones.