Get the most out of your uke with Martin M630 Baritone Ukulele Strings. Made from clear fluorocarbon, these strings have a high tensile strength that helps hold your tuning better while increasing the harmonic output of your instrument. Martin M630 strings produce consistent tone that is true and defined. Take it from the crew at Sweetwater - Martin strings always produce great tone from your instrument. See how good your uke can sound with a set of Martin M630 Baritone Ukulele Strings.