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.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
