D'addario Pro Arte EJ45 classical guitar strings set

Pro-Arte's are preferred by players and guitar makers for their excellent tone, precision, and consistency. Each Pro Arte treble string is measured 200 times by a sophisticated, computer-controlled laser system that performs consistency and quality control checks while determining the string's exact playing tension.  Pro-Arte basses are wound using silverplated copper on a multi-filament nylon core. 56 strings full set in Medium tension.