DESIGNED FOR THE PUERTO RICAN CUATRO. PLAIN STEEL, AND SILVER-PLATED COPPER STRING CONSTRUCTION. PLAIN STEEL, AND SILVER-PLATED COPPER STRING CONSTRUCTION. WARM AND PROJECTING, LONG LASTING TONE. 10-STRINGS, GENERALLY TUNED IN FOURTHS - B TO E. MADE IN THE U.S.A. FOR THE HIGHEST QUALITY AND PERFORMANCE. ENVIRONMENTALLY FRIENDLY, CORROSION RESISTANT PACKAGING FOR STRINGS THAT ARE ALWAYS FRESH