Description: Prewired 13.8mm diameter brass piezoelectric discs These are perfect for using as touch-sensors, electronic drum triggers, buzzers, or making your own contact mics. 13.8mm brass diameter plate, 80mm leads Nominal frequency 0.113 (MHz) Capacitance @0.113 (MHz)? 3200?pF? Specification: Nominal frequency: 0.113 (MHz) Adjust the frequency difference: 0.001 (MHz) Temperature frequency difference: 0.001 (MHz) Total frequency difference: 0.003 (MHz) Load capacitance: 3200 (pF) Load Resonance Resistance: 250 (?) Excitation level: 0.5 (mW) Reference temperature: 26 ( °C) Insertion loss: 3 (dB) Stopband attenuation: 2 (dB) Input impedance: 0.2 (k?) Output impedance: 0.2 (k?) Package Includes: 1 Piece Piezo Disc