Shadow Quadducer contact pickup. I received this new-old stock from an acquaintance a few years ago for amplifying an acoustic guitar, but I ended up installing a piezo pickup in the bridge, so I never used it. The packaging was old when I received it, but it's basically unused. Please note that double-sided tape for attaching the pickup is not included. I have checked for continuity and contact, and there were no problems. Please refrain from purchasing if you are sensitive to used items. For reference, I have included the URL of the manufacturer's website below. http://www.ariaguitars.com/jp/items/other-brands/shadow/ Thank you for your consideration.