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1. 5pcs 50mm wide brass piezoelectric discs. These are perfect for using as touch-sensors, electronic drum triggers, buzzers, or making your own contact mics. To use, simply solder positive to the center and ground to the brass disc. Center disc measures approx. 25mm wide. Profile is approx. 0.43mm thick. 2. Piezo-element Specification: Type:External drive type element Resonant Frequency:2.8 ± 0.5 KHz Resonant Impedance:200Ω max Capacitance:35000pF ± 30% at 100Hz Input Voltage:30Vp-p max Operating Temperature:-20 to +60°C Storage Temperature:-20 to +70°C Base Material:Brass