Martin MA550 Medium 13-56 Phosphor Bronze Guitar Strings

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.

Gauge: Medium
E: .013
B: .017
G: .026
D: .035
A: .045
E: .056
Tension: 190.9