... / High sound pressure 4,MOQ;1000pieces High Quality SWT Piezoelectric Diaphragm for External Drive Main feature of Piezo ... of piezo ceramic element & Attributive Characters:1, Electrode form/ Modulating: External drive (diode); Self drive (transistor);2, Thickness: Thick (T> ... diameter is 8mm, Biggest is 65mm;4, Metal plate types: Brass, Nickel, Stainless steel;5, Connection terminal: Solder wire or ...