Cordoba Launches the 21 Series Ukulele at Winter NAMM 2018January 26, 2018Subscribe to Ukulele on Cordoba’s 21 Series ukulele features a spruce top, striped ebony back and sides, and finished with a satin laminate. The 21 Series is available in five sizes: soprano, concert, tenor, tenor cutaway acoustic-electric, and baritone. Advertisement Comments