D'Addario EJ25B Pro-Arte Black Nylon Composite Flamenco Guitar Strings Deliver a flexible feel while still maintaining a quick attack response that is essential for flamenco players Laser sorted black nylon treble strings for consistent, precise intonation Corrosion resistant packaging for strings that are always fresh Made in the U.S.A. for the highest quality and performance String Gauges: Trebles .0285, .0327, .0416 Basses .029, .34, .044