D'Addario EJ45C Pro-Arte Composite Classical Guitar Strings, Normal Tension Silver plated copper wound on an exclusive Composite core material for powerful, long lasting tone Composite 3rd/G for increased projection, clear nylon 1st and 2nd strings. All laser sorted for consistent, precise intonation Normal tension offers popular balance of volume and comfortable resistance Made in the U.S.A. for the highest quality and performance String Gauges: Trebles .0280, .0322, .036 Basses .028, .35, .044