Perfect for beginner players who might like a string that’s softer to the touch and with less tension on the neck for easier playability, this is a set of Authentic Acoustic Flexible Core strings from Martin. This is a set of Phosphor Bronze Medium 13-56 strings. They aren’t just for professional players – just ask Tommy Emmanuel, who performs with our Flexible Core strings night after night. Martin starts with their highest tensile-strength core wire, then tin-plate it on all six strings for added corrosion resistance; because what you dont see matters! When coupled with their highest quality wrap wire, you get a consistent true tone that you can count on song after song.