Dogal UBS162 UKUBASS Nickel wound String SET Ukulele Bass ukulele
Kala KA-BASS-4FW Metal Flat Wound 4 String UBASS Set – Easy Music Center
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Journeyman Acoustic-Electric U•BASS® with F-Holes – Kala Brand Music Co.™
Mahalo Solid Electric Bass Ukulele, Natural at Gear4music
Aquila 68U Thundergut 4 String Set GDAE Bass Ukulele Strings 18-21 in Scale