Martin MA150PK3 Authentic Acoustic (3 Packs) Guitar Strings - Medium 13-56 blue Highly directional supercardioid polar pattern

Highly directional supercardioid polar pattern and smooth off-axis response

or other structures

Power Supply Unit

Measures DC amps up to 20 amps(careful

But in the most pleasant way

Martin MA150PK3 Authentic Acoustic (3 Packs) Guitar Strings - Medium 13-56 blue Highly directional supercardioid polar patternMartin 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. Martin's impeccable standards for acoustic guitar tone are embedded in their string design and precision manufacturing process. Gauge: . 013 . 017 . 026 . 035 . 045 . 056 Tension: 189. 6