Martin FX strings use an advanced thin core wire to increase flexibility and improve sustain without sacrificing tone, durability or playability.

Martin FX645 80/20 Bronze Acoustic Light/Medium Strings Features:

• Set: MFX645
• Gauge: Light/Medium
• 12.5-16.5-25.5-33.5-43.5-55
• Tension: 171.9

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