The Martin Authentic Acoustic Superior Performance Phosphor Bronze 12-String Guitar 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 our string design and precision manufacturing process, making them some of the best acoustic strings you can have! This 12-string set is gauged at 10 - 47 Extra Light.

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