Martin MA140 Authentic Acoustic SP Strings, 80/20 Bronze Light (.012-.054)

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Martin MA140 Authentic Acoustic SP Strings, 80/20 Bronze Light (.012-.054)

Bright, bold, and built to last—Martin’s MA140 Authentic Acoustic SP strings are a reliable favourite for players who want that classic acoustic zing with the durability to go the distance. These light gauge 80/20 bronze strings deliver a crisp, punchy tone that makes your guitar shine in both live and studio settings.

At .012–.054, the MA140s offer the kind of playability that works for just about every acoustic style—from strummers and songwriters to folk fingerpickers. There’s enough resistance under your fingers for dynamic playing, but not so much that it wears you down. Whether you're bashing out big open chords or coaxing out delicate harmonics, these strings respond with clarity and precision.

The 80/20 bronze wrap wire brings that unmistakable high-end sparkle and midrange chime, ideal for guitars that need a bit more top-end bite or for players who want their tone to cut through the mix with confidence. And thanks to Martin’s Superior Performance (SP) specs, the core wire is drawn for extra tensile strength—meaning fewer breaks, better tuning stability, and more life between string changes.

If you want a lively acoustic tone that doesn’t lose its edge after a few hours of play, the MA140s are a solid, stage-tested choice. And here at Musicmaker, where we’ve been slinging string sets since the early '80s, we always keep these in stock for good reason: they just work.