D'Addario XT, Acoustic Guitar 12 String Set, Custom Light Gauge (.011, .015, .022, .032, .042, .052), Phosphor Bronze Round Winding, Steel Hexagonal Core, D'Addario Item XTAPB1152.

XT Acoustic Phosphor Bronze strings combine the popular acoustic alloy with an extended lifespan treatment on every string in the set, preserving the natural tone and feel of uncoated strings.