Martin MSP6000 SP Lifespan 80/20 Bronze Acoustic String， Extra Light<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"> 80/20 bronze provides a bright and vibrant tone </span></li><li><span class="a-list-item"> Extra Light gauge </span></li><li><span class="a-list-item"> .010， .014， .023， .030， .039， .047 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51WRDtZBrzL.jpg" noproxy>