Pre-wired piezo mic saves time, easy to install, and convenient to use. You can attach the piezo inside or on your instrument. Drill a hole and mount the jack by inserting it through the hole and securing it with the included nut. No soldering required, no battery needed. Produces good sound quality when used with various amplifiers. Designed to help reduce external interference and minimize the impact of sound reflections from nearby surfaces.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: 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 Included: 1 x Pickup 1 x Glue Block 1 x Cable Tie Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement error allowance is +/- 1-3cm.