ELECTRIC GUITAR STRING SET Electric D string guitar sets Addario NYXL1260 for tuning in C (12 - 16 - 20 - 34 - 46 - 60). 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.