Dunlop 223 Brass Slide， Medium Wall Thickness， Medium Knuckle<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> bright resonant tone and comfortable weight </span></li><li><span class="a-list-item"> Medium Wall: 19mm inside diameter x 22mm outside diameter， fits ring size 9 </span></li><li><span class="a-list-item"> Perfect for that vintage Delta sound. </span></li><li><span class="a-list-item"> Knuckle Size </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/4151ERCl10L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/21d5gPEWRNL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/11zL7xqwCaS.png">