Pre-wired piezo mic saves time, easy to install and convenient to use. Attach the piezo inside or on your instrument, drill a hole and mount the jack. Drill a hole from inside the body, loosen the end-pin jack nut, insert it into the hole and tighten the nut. Easy to install and delivers good sound quality through various amplifiers. No soldering required. No battery required. Helps reduce interfering external sounds and minimizes influence from sound reflections. Specifications: Type: 1 to 2 Pickup Diameter: 30mm / 1.2 inches Color: Black Plug Holder Diameter: 6mm / 0.24 inches Plug Thread Diameter: 12mm / 0.47 inches Cable Length (Approx.): 55cm Material: Plastic + Metal Cable Tie Size: 115 x 2mm / 4.4 x 0.08 inches (L x W) Tie Mount Base Size: 28 x 28 x 6mm / 1.1 x 1.1 x 0.24 inches (L x W x T) Package Contents: 1 x Pickup 1 x Glue Block 1 x Cable Tie Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3cm.