D'Addario XT Classical Hard Tension Silver Plated Copper Guitar StringsD'Addario XT Silver Plated Copper Classical Guitar Strings, Hard Tension String Gauges: . 029, . 033, . 041, . 029w, . 036w, . 046w XT Classical strings combine D'Addario's famous Pro Arte treble strings and silver plated wound composite basses with an extended lifespan treatment, preserving the natural tone and feel of uncoated strings. Available in normal, hard, and extra hard tensions. DAddario XT strings offer extended lifespan while maintaining