This is a rod-style piezo, made to be installed beneath the saddle of a standard acoustic guitar as a pickup device. These also work GREAT as pickups in Cigar Box Guitars. Simply build it into your bridge, or mount them inside the box under the bridge with glue, and you'll be amazed at how much better it picks up the full range of tone when compared to a small disk piezo. These rod piezos come with a 2.5mm plug at the end of a 12 1/2" braided lead. You can either cut the plug off and solder the lead direct to your jack, or you can get a 2.5mm jack and wire that into your circuit. These piezo rods are 2 3/4 inches in length, about 3/32" wide and 1/8" in height. They can also be cut to shorter lengths if need be - see our how-to article on cutting rod piezos for more information. Please note that we do not include installation instructions with these rod piezos - you need to know how to use them if you buy them!