Martin MA550 Authentic Phosphor Bronze Acoustic Guitar Strings - Medium

String gauge: E - .013, B - .017, G - .026, D - .035, A - .045, E - .056

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 precision manufacturing process.