Martin MA150 Acoustic Superior Performance 80/20 Bronze Guitar Strings 13/56 Med

Features: Strings designed by C.F. Martin & Co. to provide superior tone for your acoustic guitar Tin-plate-coated for extra longevity and enhanced tone Highest-quality materials mean outstanding tone, response, and durability Strings subjected to Martin's rigorous pre-market testing to ensure consistency and quality Gauges: .013, .017, .026, .035, .045, .056 Core Material: Tin-plated Steel Not coated New, unopened package. No tags. Buy from me. I'm a small business. And very nice. :)