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SP Flexible Core

SP Flexible Core

It isn't just about flexibility; it's about bending the note till it rings true.

Martin SP Flexible Core strings marry our thinnest core wire to our standard tensions. Our SP Flexible Core strings feel soft to the touch, making them ideal for beginners. But don't be fooled by comfort! Just ask Tommy Emmanuel who performs with our SP Flexible Core strings night after night. With SP Flexible Core, you get total flexibility and total control.

92/8 Phosphor Bronze

Martin SP Flexible Core 92/8 Phosphor Bronze acoustic guitar strings are made with the highest quality bronzed steel core wire and phosphor bronze wrap wire.

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Weight E B G D A E Tension Model
Custom Light .011 .015 .023 .032 .042 .052 151.7 MFX775 BUY NOW
Light .012 .016 .025 .032 .042 .054 164.8 MFX740 BUY NOW
Medium .013 .017 .026 .035 .045 .056 186.2 MFX750 BUY NOW
Custom 12-String .010
.010
.014
.014
.025
.010
.032
.012
.042
.018
.054
.027
275.3 MFX700 BUY NOW

Silk & Phosphor

Martin SP Flexible Core Silk & Phosphor acoustic guitar strings are made with bronzed steel core wire.

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Weight E B G D A E Tension Model
Custom .011 .013 .023 .028 .038 .047 128 MFX130 BUY NOW

String Training

String Training

Wrap wire, core wire, bronze, phosphor, Monel: learn what exactly makes our strings special, and why your favorite string is right for you

Ambassadors

Ambassadors

Our strings cross the world's biggest stages night after night, always holding true. Learn who's playing Martin Strings

Pro Tips

Pro Tips

Learn how to string your 6-string, 12-string, which strings, when to change strings, and more, direct from the Pro Dave Doll, right here at Martin Guitar

String Selector

String Selector

Find your perfect Martin strings. Choose by brightness, tension, style or artist’s choice.

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