4-string set for concert or tenor ukulele from Uke-Pro series that will allow you to finally play up the fingerboard in tune, taking solos you may have been anxious to attempt. Strings are made with high quality rectified nylon to ensure perfect intonation. The 4th string is wound with golden alloy - 80/20 brass. This set is packaged using MAP Technology (Modified Atmosphere Packaging) to prevent tarnishing and ensure freshness. Gauges: .029, .033, .041, .030W.