Martin FX Flexible Core 80/20 Bronze Acoustic Guitar Strings
  FX Flexible Core, strings are 80/20 bronze wound. A thinner core wire delivers greater player control with sharp attack, increased flexibility and improved harmonic sustain. Can ease the transition from electric to acoustic, more user-friendly for new players.
Gauges:
MFX675 Custom Light 11-52
MFX640 Light 12-54
MFX645 Light Med 12.5-55
MFX650 Medium 13-56
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