Since D'Addario introduced Phosphor Bronze strings for acoustic guitars in 1974, they have become synonymous with a warm, balanced sound. The XT Phosphor Bronze offers just that and more: it is more break-resistant, stable in tuning, and durable than standard Phosphor Bronze strings. The XT coating provides improved corrosion resistance while maintaining the warm tone and natural feel of the uncoated string. Beneath the winding, these XT acoustic strings feature a NY Steel core, a Phosphor Bronze wrap wire, and Fusion Twist technology, which ensures tonal versatility and added elasticity, making them excellent for a variety of acoustic styles. This set in the 11-52 Custom Light gauge has slightly more volume and projection than Extra Light, yet is still easy to play.