TOOGOO(R) Guitar Parts Acoustic Pickup Pre-Wired Piezo Amplifier Jack It's the perfect option for builders who want to put a basic piezo pickup in their builds, but don't want to be bothered with the headaches that come with sourcing the individual parts, let alone soldering and wiring them. This is a pre-wired, pre-soldered piezo & jack harness that makes it simple for you. All you have to do is attach the piezo in or on your build, drill a hole and mount the jack, and you're done! The 8" leads give you plenty of lee-way to mount the piezo and jack It has a 1/4" long-shaft phone jack, and a 9.5mm threaded shaft The piezo is a high-quality 20mm Murata piezo transducer, and the leads are 24-gauge stranded copper wire