Pirastro Obligato 3/4 Upright Double Bass A String - Medium Gauge - Chromesteel Wound Synthetic Core<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> A String </span></li><li><span class="a-list-item"> For Upright String Double Bass </span></li><li><span class="a-list-item"> Medium Gauge </span></li><li><span class="a-list-item"> Chromesteel-Wound Solid-Synthetic Core </span></li><li><span class="a-list-item"> Those wanting a traditional bluegrass， old school jazz and blues， or other styles that calls for that sound will enjoy the Obligatos. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31QOeUDiWDL.jpg" noproxy>