BASS STRING SET Medium Scale Bass Strings Sets CR Series Chrome Flat Wound (045 - 065 - 080 - 100) Medium Scale. 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 option for Jazz, R&B, and Pop musicians.