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SP Flexible Core

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SP Flexible Core Guitar Strings

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.

Weight E B G D A E Tension Model
Custom Light .011 .015 .023 .032 .042 .052 151.7 MFX775
Light .012 .016 .025 .032 .042 .054 164.8 MFX740
Medium .013 .017 .026 .035 .045 .056 186.2 MFX750
Extra Light 12-String 1-6 .010 .014 .025 .032 .042 .054 275.3 MFX700
Extra Light 12-String 7-12 .010 .014 .010 .012 .018 .027 275.3 MFX700

Silk & Phosphor

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

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