ELECTRIC GUITAR STRINGS SET Electric guitar string sets D Addario NYXL1156 for tuning in D (11 - 14 - 19 - 32 - 44 - 56). D Addario NYXL guitar strings stretch more, sound louder, and tune better than any string you've ever played before. Conceived, refined, and manufactured by D Addario in New York, this newly designed, tear-resistant, high-carbon steel and smooth steel core provides a new level of freedom, confidence and power.