Martin MA550 Phosphor bronze 013-056

No bells. No whistles. Just pure, singing tone. Martin Traditional strings are our flagship line that stands the test of time. Tried and true, they are designed to deliver consistent quality and tone with every set. Great for daily play and appropriate for all skill levels, our traditional strings are available in 80/20 Bronze, 92/8 Phosphor Bronze and Silk & Steel Folk.Martin Traditional 92/8 Phosphor Bronze acoustic guitar strings are made with tin-plated steel core wire and phosphor bronze wrap wire. Weight E B G D A E Tension Model Extra Light .010 .014 .023 .030 .039 .047 133.3 M530 Custom Light .011 .015 .023 .032 .042 .052 151.7 M535 Light .012 .016 .025 .032 .042 .054 164.8 M540 Medium .013 .017 .026 .035 .045 .056 186.2 M550 Extra Light 12-String 1-6 .010 .014 .023 .030 .039 .047 249.6 M500 Extra Light 12-String 7-12 .010 .014 .010 .012 .018 .027 249.6 M500