Specifications:Feature: - Nylon string core, silver-plated copper alloy wrapped string.- Light black nylon strings. Silver-plated copper alloy, Paul rustproof brass coating technology.- Anti-oxidation life is 4-5 times of unprotected strings.- Good sound and unique visual effects.- Perfect nylon strings for your classical guitar.Material: NylonString Diameter: 0.71 / 0.81 / 1.02 / 0.76 / 0.89 / 1.09 mm( 028"/ .032"/ .040"/ .030"/ .035"/ .043" )Package Weight : 23 G / 0.81 OuncesPackage Dimensions (L*W*H) : 110*110*10 MM / 4.33*4.33*0.39 InchesRetail Packaging: No, No PackingPackage Include:1 x Guitar Strings Set