D'ADDARIO'S POPULAR EXTRA-LIGHT GAUGING WITH AN EXCLUSIVE PRECISION POLISHING PROCESS FOR REDUCED FINGER NOISE. SMOOTH, FLATTENED PLAYING SURFACE, SUPERB TONE AND SUSTAIN ASSOCIATED WITH PHOSPHOR BRONZE STRINGS. SMOOTH, FLATTENED PLAYING SURFACE, SUPERB TONE AND SUSTAIN ASSOCIATED WITH PHOSPHOR BRONZE STRINGS. 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 .012, .016, PHOSPHOR BRONZE WOUND .024, .032, .042, .053.