20PCS 12mm Piezo Elements Sounder Sensor Trigger Drum Disc+Wire Copper

The right size for 3 under the bridge of acoustic guitar.

Plugs right into my phone after attaching 3.5 mm plug!

I bought these to make high impedance headphones. Glued to circles of very thin metal (like you can find in beer cans) and placed in a pair of busted headphones, these allow good performance when driven by a crystal radio or vacuum tube receiver.

These have a very small output signal that makes me think the piezo element is tiny, tiny.

Notice how small they are they work great just make sure you understand mm sizes when ordering.

I bought these to make my own "western mini" type system. The small size is perfect. I soldered three of them to a pigtail that is now connected to a fishman prefix in my gretsch rancher Jr. Replaced a shot under saddle transducer. Coated the connection side of the discs with hot glue to protect them, then super glued them to the bridge plate using K&K's directions, and they work like a charm.

This purchase was very much so, easy on my wallet, and they were delivered faster then I expected. My only concern is that they arrived and despite my excitement and urgency to use them. They were very tiny and not capable enough for the application I bought them for. My advice for this seller is to put up a comparison photo of one or whole set of these in their hand or one next to a finger or thumb. That way others won't be a confused as I was. I still found an application for a few of these and are working great! Thank you again

Read carefully. These are tiny! (Still gunna try em! Lol)

Pas surper bon produit car la moitié non fonctionnelle mais réussi car j avais besoin de 6 seulement mais je suis déçu du produit

To small.. my mistake