Autentic Acoustic Flexible Core, phosphor bronze 011 - 052 custom light .011 - .015 - .023 - .032 - .042 - .052 Martin Authentic Acoustic 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.
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