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Martin Authentic Acoustic SP? guitar strings are part of Martin?s improved range of acoustic guitar strings. Martin Authentic Acoustic SP? strings are engineered with the performer in mind and stand up to rigorous practice and performance schedules. They are made with a high tensile-strength core wire, then tin-plated for added corrosion resistance. Combined with highest quality wrap wire they provide consistent true tone that you can count on song after song. Martin Authentic Acoustic SP? strings offer excellent tuning stability, corrosion resistance and great playability String Gauges: 11.5-14-23-28-38-47 Tension: 122.2