D'Addario XT11/40 Phosphor Bronze Mandolin Strings .011-.040w XTM1140D'Addario XT Mandolin Phosphor Bronze strings combine our most popular mandolin alloy with an advanced corrosion resistance treatment on every string in the set, preserving the natural tone and feel of uncoated strings. Available in medium, custom medium, and medium heavy gauges. Features XT strings feature an extended lifespan treatment on every string in the set, preserving the natural tone and feel of uncoated strings. High carbon steel wire and