Three sets of Martin 80/20 Bronze Acoustic Guitar Strings. Medium Gauge, .013-.056.
These strings are engineered with the performer in mind and they will always stand up to rigorous practice and performance schedules. Martin string manufacturing process starts with their highest tensile-strength core wire, then tin-plate it on all six strings for added corrosion resistance. When coupled with their highest quality wrap wire you get consistent true tone that you can count on song after song. Martin MA150 Authentic Acoustic SP Strings offer excellent tuning stability, corrosion resistance and great playability.