Martin M170 80/20 Bronze Extra Light 3-Pack Acoustic Guitar Strings<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Bronze alloy for brilliance and long lifeStudio-quality performance </span></li><li><span class="a-list-item"> The bronze winding is ideally suited for making strings that have deep， rich basses and clear， bright trebles </span></li><li><span class="a-list-item"> Gauges: 10-14-23-30-39-47 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51XnXlz%2BuXL.jpg" noproxy>