EJ45, normal tension, is D'Addario's best selling classical set, preferred for its balance of rich tone, comfortable feel and dynamic projection. D'Addario's best selling Pro Arte 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 Environmentally friendly, corrosion resistant packaging for strings that are always fresh