 Martin Fx740 Sp Flexible Core Phosphor Bronze Light Acoustic Guitar Strings 10-PackStock up with this 10-pack. Martin FX strings use an advanced thin core wire to increase flexibility and improve sustain without sacrificing tone, durability or playability. Gauge: Light 12-16-25-32-42-54 Accessories, Strings, Guitar Strings, Acoustic Guitar Strings, 6 String Sets for Acoustic Guitar, .012 Gauge Acoustic Guitar Strings Martin 41MFX74010PK Martin, .012 Gauge Acoustic Guitar Strings |