Martin MA180 Authentic Superior Performance Acoustic Guitar Strings. MA180 - Extra Light Gauge.010. 014. 023. 030. 039. 047. MA180: 80/20 Bronze Extra Light Gauge12 String set. 010 -. 047. The core wire is the highest tensile-strength Martin has and each string is tin-plated for corrosion resistance; because what you don’t see matters!
