Martin MA550 Authentic Acoustic SP Guitar Strings Phosphor Bronze Medium 13-56 BCT-DELAY 000 microfibers per square inch

000 microfibers per square inch providing twice the amount of leading competitors to quickly remove dust

129 dB peak SPL utilizing high sensitivity transducer designed and engineered by EV for maximum punch

high powered compression driver

The Controlled Sound® Coated Bottom Black Dot™ features focused midrange tones with added durability

there was only one choice – Celestion

Martin MA550 Authentic Acoustic SP Guitar Strings Phosphor Bronze Medium 13-56 BCT-DELAY 000 microfibers per square inchProduct Information Martin Authentic Acoustic SP strings offer excellent tuning stability, corrosion resistance and great playability. Martin Authentic Acoustic Superior Performance SP strings feature higher tensile strength and tin plated core wire on all six strings that enable a fuller and more balanced tone, quicker response and increased tuning stability. Our impeccable standards for acoustic guitar tone are embedded in our string design and