Aquila 103U strings set for concert ukulele. Considered an upgrade to New Nylgut, Super Nylgut strings have a smooth, polished surface that feels like wax. Super Nylgut is not as stretchy as New Nylgut, which allows for quicker setting to the proper intonation when new and stronger intonation maintenance. Super Nylgut is more resistant to sharp nut edges, fret markers, or hard nail playing.