I found a bass with rubber strings : r/mildlyinteresting
5 Awesome Bass Ukulele Strings & Ukuleles That you Need
30 Inch Electric Bass Ukulele Ukelele Uke Sapele Plywood Body Padauk Fretboard Rubber Strings Built-in Tuner EQ with 3 Meters Audio Cable | Walmart Canada
Amazon.com: Batking Electric Ukulele,30 Inch Cutaway Bass Wooden Electric Acoustic Bass Ukulele Ukelele Built-in EQ Tuner with F Sound Holes : Musical Instruments
MicroBass Rubber/Polymer Strings | Gold Tone Folk Instruments
Bass Centre Ashbory Bass
5 Awesome Bass Ukulele Strings & Ukuleles That you Need