BASS STRING SET Bass strings set CR Series Chrome Flat Wound ECB84 (040 - 060 - 080 - 100). D Addario Chromes Bass Strings are famous for their soft touch and warm, melodious tone. The ropes are made by winding a flat outer layer, which will later be polished to obtain an extra-smooth finish. Chrome delivers a deep, rich sound that makes them the flat wound choice for Jazz, R&B, and Pop musicians.