Normal Tension classical guitar string;
D’Addario EJ45C Composites feature an exclusive high-tech Zyex(R) multi-filament stranded core, which delivers gut-like guitar tone with extremely long life and consistency. D’Addario Pro-Arte Composite silver plated copper classical guitar strings provide longer life than traditional D’Addario Pro-Arte guitar strings. All D’Addario Pro-Arte treble guitar strings are sorted by a sophisticated computer-controlled laser machine which performs diameter/tension measurements and quality checks, insuring true sounding, and precise guitar trebles in every set. D’Addario Composite sets feature an additional Composite 3rd guitar string, which provides tonal options and nicely balances nylon and wound guitar strings.