Martin MA150 Medium Acoustic Guitar Strings 13-56 (80/20 Bronze)

Martin MA150 Acoustic Strings.  Martin MA150 SP 80/20 Bronze Authentic Acoustic Guitar Strings Medium 13-56.  These strings are engineered with the performer in mind and they will always stand up to rigorous practice and performance schedules. We start with our highest tensile-strength core wire, then tin-plate it on all six strings for added corrosion resistance; because what you don’t see matters! When coupled with our highest quality wrap wire you get consistent true tone that you can count on song after song. Available in 80/20 Bronze and 92/8 Phosphor Bronze. Martin Authentic Acoustic SP® strings offer excellent tuning stability, corrosion resistance and great playability.