ELECTRIC GUITAR STRING KIT Electric guitar string sets D Addario NYXL1046BT (10 - 13.5 - 17 - 25 - 34 - 46). D Addario NYXL guitar strings stretch more, sound louder, and tune better than any string you've ever played before. Conceived, perfected, and manufactured by D Addario in New York, this newly designed, tear-resistant high carbon and smooth steel core provides a new level of freedom, confidence, and power.