Kepo piezo elements for audio transducers kepo ft 12t 58b1 463 the keno piezo element 500 o 58 05khz is a 12mm diameter piezo element with a 10000nf30nf capacitance that can be used for a small audio transducer such as a buzzer kepo ft 12t 58b1 463 piezo element 500 ohm 58 05 khz 12mm