D'ADDARIO'S BEST SELLING FLATWOUNDS OFFERS BALANCE OF SMOOTH FEEL AND WARM, MELLOW TONE-. RIBBON WOUND AND POLISHED FOR ULTRA-SMOOTH FEEL AND WARM, MELLOW TONE. RIBBON WOUND AND POLISHED FOR ULTRA-SMOOTH FEEL AND WARM, MELLOW 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, STAINLESS STEEL FLAT WOUND .022, .030, .040, .050.