Pre-wired piezo mic save time , easy to install, convenient e You can attach the piezo in or on your build, drill a hole and mount the jack Drill a hole from inside the body, loosen -pin jack nut,insert it to the hole and tighten the nut Very easy to install and sounded good through several different amps, No Soldering Required, No Battery Required With the advantage of being to eliminate interfering external sounds and not be influenced by sound reflections from nearby objects Specification: Type: 1 to 2 Pickup Dia: 30mm or 1.2inch Color: Black Plug Hold Dia.: 6mm or 0.24inch Plug Thread Dia.: 12mm or 0.47inch Cable Length(.): 55cm Material: Plasticand Metal Cable Tie Size: 115x2mm or 4.4inchx 0.08inch(LxW) Tie Mount Base Size: 28x28x6mm or 1.1inchx 1.1x 0.24inch(LxWxT) Package Included: 1 x pickup 1 x glue block 1 x Cable tie Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.