Martin M140 Acoustic Bronze Light ( 12-54 )
Martin M140 Acoustic Bronze Light ( 12-54 ). The string that started it all 50 years ago is now back by popular demand. Martin’s original M140 light gauge strings, with 80/20 composition, are ideally suited for players who love deep, rich bass tones and clear, bright trebles. Providing brilliance and clarity, Martin M140s are perfect for daily use and all playing styles.