Cello Violoncello Design: It features standard pointed corner bouts and sharp, perpendicular shoulders where the upper bout meets the neck. Double basses traditionally feature sloping "violin" or "gamba-style" shoulders.Fine Tuners on Tailpiece: The tailpiece features a set of four metallic fine tuners. Double basses are typically tuned solely at the pegbox via geared metal tuners, while cellos rely heavily on built-in tailpiece fine tuners.