D'Addario Pro Arte Extra Hard Tension Silverplated Wound Clear Nylon Classical Guitar Strings. 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.

Gauges: 29, 33.3, 41.6, 30, 36, 45