CONCERT UKELELE Each of the instruments in the Bamboo series is made of natural solid bamboo. You can choose between soprano, concert, tenor or bass ukulele. These ukuleles feature a MagusUke preamp, cutaway, and black Graph Tech Ratio tuners. The bass uke comes with an F hole and beautiful black hardware. All of these instruments are available in 'natural' or 'jean stone wash' finish.