A D'ADDARIO HYBRID GAUGE, COMBINING LIGHT GAUGE BOTTOM STRINGS WITH LIGHTER TOP STRINGS FOR EASY BENDING. PREFERRED FOR ITS WARM, BRIGHT, AND WELL BALANCED ACOUSTIC TONE. PREFERRED FOR ITS WARM, BRIGHT, AND WELL BALANCED ACOUSTIC TONE. ENVIRONMENTALLY FRIENDLY, CORROSION RESISTANT PACKAGING FOR STRINGS THAT ARE ALWAYS FRESH. MADE IN THE U.S.A. FOR THE HIGHEST QUALITY AND PERFORMANCE. STRING GAUGES: PLAIN STEEL .011, .015, PHOSPHOR BRONZE WOUND .022, .032, .042, .052.