D'Addario Single Bass Chromes Flat Wound 040 Long Scale Strings .040 - single string / E-Bass Chrome Flatwound, polishedSmooth feel and warm, mellow tone. Wound strings using an outer flattened, ribbon wire which is then polished to an incredibly smooth finish. Chromes deliver a deep, rich low bottom end that make them the flat wound choice of Jazz, RandB, and Pop musicians.