Martin MA180T Authentic Lifespan 2.0 Treated 80/20 Bronze 12-String Extra Light Acoustic Guitar Strings,

These Martin MA180T Authentic Lifespan 2.0 Treated 80/20 Bronze 12-String Extra Light Acoustic Guitar Strings, are engineered using a patented technology only available from Martin. This technology was developed to protect the core wire and the wrap wire to prevent corrosion without compromising tone, the single most important attribute of the guitar strings. Authentic Acoustic Lifespan 2.0 strings look better, sound better, and feel better, providing a smooth playing experience that reduces finger drag.

Martin Authentic Acoustic Lifespan 2.0 strings offer next generation treatment for long life, great playability and feel, and superior reliability with authentic tone.80/20 Bronze acoustic guitar strings are made with bronzed steel core wire and bronze wrap wire, then all six strings are treated for long life.