Martin Authentic Acoustic strings are engineered with the performer in mind and they will always stand up to rigorous practice and performance schedules. The tensile-strength core wire is tin-plated on all 12 strings for added corrosion resistance.
Martin Authentic Acoustic SP strings offer excellent tuning stability, corrosion resistance and great playability.
Gauge: Extra light 12-string
Gauges: 10, 14, 23, 30, 39, 47 & 10, 14, 10, 12, 18, 27