Ernie Ball Earthwood 12-String Medium 80/20 Bronze Acoustic Set， .011 - .052<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Wound Strings are 80% copper， 20% zinc wire wrapped around hex shaped tin plated steel core wire </span></li><li><span class="a-list-item"> Plain strings are made of specially tempered tin plated high carbon steel </span></li><li><span class="a-list-item"> The most popular acoustic guitar string alloy </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/61L-udkh%2BpL.jpg" noproxy>