ELECTRIC GUITAR STRING KIT 7-string electric guitar sets D Addario NYXL1059 (010-013-017-026-036-046-059) .D Addario NYXL guitar strings stretch more, sound louder, and tune better than any string that you have played before. Conceived, refined, and manufactured by D Addario in New York, this newly designed, shatter-resistant high carbon and smooth steel core provides a new level of freedom, confidence and power.