Since 1974, D'Addario's Phosphor Bronze strings have been a staple in delivering a balanced, warm tone. XT Phosphor Bronze ups the ante with added break-resistance, improved pitch stability, and a longer life than standard strings. XT also offers an enhanced corrosion-resistant coating, while preserving the natural feel and warm tone of a traditional string. The Light gauge 10-47 12-string set features a NY Steel core, phosphor bronze wrap wire, and Fusion Twist tech, allowing for greater play-ability across multiple acoustic genres. An ideal addition to any 12-string acoustic guitar.