Pre-wired piezo mic save time for you, easy to install, convenient to You can attach the piezo in or on your build, drill a hole and mount the Drill a hole from inside the body, loosen -pin nut,insert it to the hole and tighten the nut Very easy to install and sounded good through different amps, No Soldering Required, No Battery Required With the advantage of being able to eliminate interfering external sounds and not be influenced by sound reflections from nearby objects Specification: Type: 1 to 2 Pickup Dia: 30mm/1.2inch Color: Black Plug Hold Dia.: 6mm/0.24inch Plug Thread Dia.: 12mm/0.47inch Cable Length(Approx.): 55cm Material: Plastic+ Metal Cable Tie Size: 115x2mm/4.4inchx0.08inch(LxW) Tie Mount Size: 28x28x6mm/1.1inchx1.1x0.24inch(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 and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.