D'Addario EJ48 80/20 Bronze Pro-Arte Nylon Classical Guitar Strings, Hard Tension Hard tension offers bright acoustic tone, increased resistance strong projection 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 .0285, .0327, .0410 Basses .030, .036, .044