Aquila New Nylgut AQ-31 Concert Ukulele Strings in Fifths - CGDA - 1 Set of 4 New Nylgut strings provide better sound than traditional nylon or PVDF Designed to have excellent player feel and a sweet tone similar to that of genuine gut strings Proprietary composite material absorbs less moisture to assure tuning stability Accurately gauged strings of varying densities provides increased accuracy of fret-intonation To learn more, please see our Product Description below