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: Extra Light 12-String
E: .010/.010
B: .014/.014
G: .023/.010
D: .030/.012
A: .039/.018
E: .047/.027
Tension: 263.3