Vktech® 12Pcs 27mm Piezo Discs with Leads Mic Drum Trigger Acoustic Pickup CBG Guitar<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Plate material: Brass </span></li><li><span class="a-list-item"> Easy to install， easy to use </span></li><li><span class="a-list-item"> Resonant frequency (kHz): 4.6 +/- 0.5 KHz </span></li><li><span class="a-list-item"> Resonant impedance (ohms): 300 max </span></li><li><span class="a-list-item"> Note: Due to the difference between different monitors the picture may not reflect the actual color of the item </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41VzgO2-FVL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51tW1DekgOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31712zBBF4L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/4161xKPEnpL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41CdxUjIiEL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41FWNGrsGOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31%2BMgxODcPL.jpg" noproxy>