Check the listing for details. DR Strings Black Beauties K3 Coated Bass Strings, 5-String Set (Light, 40-120),. Condition: New. Listed at 39.99 USD. DR Strings Black Beauties K3 Coated Bass Strings, 5-String Set (Light, 40-120), BKB5-40 String Gauges (40 60 80 100 120) Brand new in original factory packaging. Z String Music® is an authorized seller. DR wants you to know: BLACK BEAUTIES™ colored bass strings combine the musical benefits of a round core design with the protection of DR’s 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 DR’s signatures. The hard coating also ensures outstanding clarity and articulation by reducing unwanted overtones. 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 DR Standard Length, 37 3/4 (ball-end to taper)