ELECTRIC GUITAR STRINGS SET Electric guitar string sets D Addario NYXL0940BT (09 - 12 - 15 - 22 - 30 - 40). 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 and smooth steel core provides a new level of freedom, confidence and power.