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.¬ÝWhen coupled with their¬Ýhighest quality wrap wire you get consistent true tone that you can count on song after song. Martin MA140 Authentic Acoustic SP¬ÝStrings offer excellent tuning stability, corrosion resistance and great playability.guitar strings
