D'addario EJ45 Pro-Art Nylon, Normal Tension Classical Guitar Strings 3-Pack D'Addario's best selling Pro-Art set, Normal tension offers balance of volume and comfortable resistance Laser sorted clear nylon treble strings for consistent, precise intonation Precision wound basses for warm, projecting tone and the utmost consistency Made in the U.S.A. for the highest quality and performance String Gauges: Trebles .0280, .0322, .0403 Basses .029, .35, .043