Kala SUB U-Bass Solid Body Bass Guitar Ukulele Black by Kala. $449.00. The Kala S-U-B U-Bass Series - More BASS, Less Space! This satin black Solid body U-Bass from Kala Ukuleles is incredibly subductive - a word that describes how the Mariana Trench, the deepest known point in the Pacific Ocean, was created. The custom U-BASS strings used produce frequencies that dive below normal bass frequencies. The tone is sublime, the feel is superb - strap one on and DIVE IN!