Authentic Acoustic Flexible Core

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Martin FX Flexible Core Acoustic Guitar Strings

Martin FX Flexible Core acoustic guitar strings utilize an advanced thin wire core to increase their flexibility and improve the sustain without sacrificing tone, durability, or playability.

These Martin strings are available in Phosphor Bronze for warmth and consistent brilliance and Silk & Phosphor for sweet and melodic playability.

Have a question about Martin FX Flexible Core acoustic guitar strings? Call 800-513-8271 to talk with our friendly music, strings, and gear experts or contact them online. They’re available Monday-Friday from 9 a.m.-3 p.m. EST.

And remember: U.S. orders received weekdays before 3 p.m. EST ship the same day!
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