Martin MSP7200 SP Lifespan 92/8 Phosphor Bronze Medium Acoustic Guitar Strings<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Treated with Martin's Clear tone proprietary technology for a longer lifespan than regular strings </span></li><li><span class="a-list-item"> Designed to repel the oils and dirt that can deaden strings </span></li><li><span class="a-list-item"> 92/8 phosphor bronze provides a classically expressive tone </span></li><li><span class="a-list-item"> Gauge (medium): .013， .017， .026， .035， .045， .056 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51DXeM0VX5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41A2TrKSXdL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31dh1P7EDKL.jpg" noproxy>