D'Addario EPS515 ProSteels Electric Guitar Strings， Medium， 11-50<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Medium gauge </span></li><li><span class="a-list-item"> Unique highly magnetic steel alloy offers brighter， crunchier tone and increased sustain </span></li><li><span class="a-list-item"> Environmentally friendly， corrosion resistant packaging for strings that are always fresh </span></li><li><span class="a-list-item"> Made in the U.S.A. for the highest quality and performance </span></li><li><span class="a-list-item"> String Gauges: Plain Steel .011， .015， .019， ProSteels Wound .028， .037， .050 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51IXE8yEXwL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51pfDdiE06L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/513g1b5XvML.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/61hI63UO1FL.jpg" noproxy>