These Are Perfect For Using As Touch-Sensors, Electronic Drum Triggers, Buzzers, Or Making Your Own Contact Mics. All the discs are made from selected copper, ensuring excellent conductivity and long-lasting use. 27mm brass outer diameter plate and ceramic inner diameter plate. Piezoelectric buzzer film. Can be fitted to used acoustic guitars, CBGs, drums, etc. Excellent accessory for acoustic instrument pickups, stompboxes, contact mics, etc. Great for acoustic instrument pickups, stompboxes, contact mics, etc.

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