Fishman Classic Series Full Circle Upright Bass Pickup - 6 x 1mm Format<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Fine tuning feature lets you quickly choose betweenan open， resonant response or amore focused tone to match your instrument andplaying style </span></li><li><span class="a-list-item"> Encased inside a sturdy aluminum heightadjuster wheel </span></li><li><span class="a-list-item"> Quick retro-fit on instruments with heightadjustment wheels </span></li><li><span class="a-list-item"> An impedance matching preamp isrecommended， but not required </span></li><li><span class="a-list-item"> Professional installation recommended </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31aC9xkt62L.jpg" noproxy>