Authentic Acoustic SP? 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._Gauges: .012? - .016? - .025w? - .032w? - .042w? - .054w?