You are buying 5 x 16mm brand new mist maker replacement disc. 

These replacement ceramic discs will be used for mist makers, humidifier or industrial grade fogger. Each replacement disc is coated with a layer of non-stick durable ceramic based coating to exhibit the best corrosion resistant than traditional or other low grade commercial disc.

General Specification :

1) Resonance Frequency : 1.7MHz +/- 50KHz

2) Resonance Impedance : < 2 Ohm

3) Static Capacitance : 1800pF  +/- 10% 

Remark :

( Sorry ! No rubber rings will be included in the deal. Please carefully check your need before purchase. )