27mm Piezo

27mm (just over an inch for you Americans) circular brass-base piezo electric element, comes with 6" leads soldered, stripped, tinned, and ready to go. Make fantastic pickups for instruments, because although they bend when electricity is applied, they also make electricity when bend is applied. Commonly used for acoustic instrument and drum machine pickups. These won't make noise without an external signal. If that's what you want, look for an "active" buzzer.

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