https://www.brookmays.com/i-j4603c-daddario-sngl-comp-037j46c-3rd-hard.html
D'Addario J4603C Pro-Arte Nylon Classical Guitar Single String, Hard Tension, Third String
Composite 3rd string, which provides more tonal flexibility and balanced volume transition between the basses and treblesHard TensionPerfect as a replacement...