Feature:1. Fine Atomizing: Ensuring fine and even atomization effect under 1.7MHz frequency, high in efficiency and stable in working.2. Practical Uses: Allows for extensive application on humidifier, dust collector, cleaner, atomizer and so on, very useful.3. Reliable Works: Adopting premium ceramic material, not easy to break, and has a long service life up to 3,500 hours as well.4. 10Pcs in Total: There are 10pcs ceramic disc in the set, and the large quantity simplifies the replacement of old parts.5. Easy to Install: Use the key tool to turn the winding ring counterclockwise to remove the old one. Then put on a new disc and tighten the upper chain ring clockwise.Specification:Item Type: Ultrasonic Mist MakerProduct Size: Approx. 20mm / 0.79inService Life: 3500hFrequency: 1.7MHzApplication: For humidifier, dust collector, sterilizer, atomizer. .Package List:10 x Ultrasonic Mist Maker1 x Iron PlateNote:Note the different sides of the ceramic plate. When installing a new ceramic plate, you need to place the ceramic plate with the white side facing up.