MartinÂ® Authentic AcousticÂ® Flexible Core strings are designed to reduce finger fatigue and allow huge bends. They feature a lighter gauge version of our Superior Performance core wire combined with heavier wrap wire to deliver a full and balanced tone with increased flex and playability. Our impeccable standards for acoustic guitar tone are embedded in our string design and precision manufacturing process. Thatâ€™s why we make our own.
- Medium .013 .017 .026 .035 .045 .056 Tension = 190.4 MA550FX