D'Addario XT Phosphor Bronze Coated Baritone Acoustic Guitar Strings - 16-70 Since D'Addario introduced Phosphor Bronze strings in 1974, they've been synonymous with warm, well-balanced tone. Beneath the coating, these XT baritone guitar strings are constructed with a NY Steel core, phosphor bronze wrap wire, and Fusion Twist technology, affording tonal versatility with added resilience.
eBay