About this item FINE ATOMIZING: Ensuring fine and even atomization effect under 1.7MHz frequency, disc is high in efficiency and stable in working. EASY TO INSTALL: Use the key tool to turn the winding counterclockwise to remove the old one. Then put on a new disc and tighten the upper chain clockwise. PRACTICAL USE: Mist maker disc allows for extensive application on humidifier, dust collector, cleaner, atomizer and so on, very useful. WORKS: Ultrasonic ceramic atomizer adopts premium ceramic material, not easy to break, and has a long service life up to 3,500 hours as well. PACKAGE: There are 10pcs ceramic disc in the set, and the large quantity simplifies the replacement of old parts, can meet your use.