DESIGNED SPECIFICALLY FOR REQUINTO GUITARS AND TUNING. RECTIFIED CLEAR NYLON AND SILVER-PLATED COPPER WOUND ON NYLON STRINGS. RECTIFIED CLEAR NYLON AND SILVER-PLATED COPPER WOUND ON NYLON STRINGS. WARM AND PROJECTING, LONG LASTING TONE. MADE IN THE U.S.A. FOR THE HIGHEST QUALITY AND PERFORMANCE. STRING GAUGES: CLEAR NYLON: .022, .028, .033, SILVER-PLATED COPPER: .025, .030, .036. ENVIRONMENTALLY FRIENDLY, CORROSION RESISTANT PACKAGING FOR STRINGS THAT ARE ALWAYS FRESH