Martin SP Flexible Core 13-56 Med Phosphor Bronze Acoustic Guitar Strings 550FX Capo These envelopes have VCI technology

These envelopes have VCI technology built into the paper itself

a more focused low end and thicker tone

This means the cores are brought to their concert pitch in the winding process

Ernie Ball RPS (Reinforced Plain Strings) Extra Slinky Electric Guitar Strings

Martin SP Flexible Core 13-56 Med Phosphor Bronze Acoustic Guitar Strings 550FX Capo These envelopes have VCI technologyMartin 6 String SP Flexible Core Acoustic Guitar Strings Gauge: 13 56 (medium) Finish: Phosphor Bronze Guitar: Acoustic 6 String Gauges: . 013 . 017 . 026 . 035 . 045 . 056 Code: MA550FX It isn't just about flexibility; it's about bending the note till it rings true. Martin SP Flexible Core strings marry our thinnest core wire to our standard tensions. Our SP Flexible Core strings feel soft to the touch, making them ideal for beginners. But don't be