File:Martin Soprano Ukulele, Style 1 (1950-1960), Museum of Making Music.jpg - Wikimedia Commons
Martin 41Y18M605 Premium Polygut Soprano Ukulele Strings | Sweetwater
Ukulele Premium Polygut® Strings | Ukulele | Martin Guitar
New Martin ukulele strings, they call it “POLYGUT” they developed it exclusively with Aquila.M605 polygut strings. A new one to try 😊☺️🤗 with my Kiwaya KTS-4 : r/ukulele