Martin Authentic Acoustic Guitar Strings

Martin Authentic Acoustic Superior Performance (SP) strings are engineered with the performer in mind, so they will always stand up to rigorous practice and performance schedules. The core is Martin’s highest tensile-strength which is then tin-plated for corrosion resistance (including the non-wounds). The cores are then wrapped with Martin’s highest quality 92/8 Phosphor Bronze wire which consistently delivers a warm, full and balanced tone.