Superb tone that really lasts. Gauges: 10-14-23-30-39-47. D'Addario EJ38 12-String Light Acoustic Guitar Strings employ a genuine phosphor bronze alloy that retains flexibility as well as brilliant tone for many hours of hard play. Computer-controlled wrapping around a hex core ensures consistency and extends life. Many top guitarists won't play any brand other than D'Addario.Regardless of your playing style, D'Addario has a set of strings that's right for you. FEATURES They retain their brilliance long after similar bronze and brass alloy strings go dead.