DELIVERS A FULL TONAL SPECTRUM, REVEALING THE UNIQUE TONAL QUALITIES OF YOUR ACOUSTIC GUITAR. INCREASED CORROSION RESISTANCE FOR A LONGER LASTING UNCOATED STRING. INCREASED CORROSION RESISTANCE FOR A LONGER LASTING UNCOATED STRING. FEATURE D’ADDARIO’S EXCLUSIVE HIGH-CARBON NY STEEL FOR UNPRECEDENTED STRENGTH AND TUNING STABILITY. ENVIRONMENTALLY-FRIENDLY, CORROSION-RESISTANT PACKAGING KEEPS STRINGS FRESH. MADE IN THE U.S.A. FOR THE HIGHEST QUALITY AND PERFORMANCE. STRING GAUGES: PLAIN STEEL .010, .014, NICKEL BRONZE WOUND .023, .030, .039, .047