Material: The humidifier stick is made of high-quality cotton material, which has good absorbency, is insoluble in water, and is not easy to stick. Size: The cotton filter rod is about 10/4 inches long and 0.8 cm/0.3 inches in diameter. The package contains 20 pieces, which is enough to meet your daily needs. Easy to install: The removal and installation of the humidifier core is very simple, please soak the filter rod until it is completely wet before inserting it into the humidifier. Protect your humidifier: When you find that your humidifier is producing less steam or even stops working, and the machine is getting hotter, try replacing the filter, and don't worry about the lifespan of your humidifier (usually replaced in 1 to 2 weeks One time filter) filter) Wide range of uses: The humidifier filter stick is a practical tool for office, room and travel use, allowing you to enjoy good conditions and bring you a good mood. Material: Cotton Dimensions: 10x0.8 cm/4x0.3 inches color: White Quantity: 20 pieces Features: 1: Humidifier replacement filter, can be cut short to fit your own humidifier of the same size. 2: Humidifier not included. Please soak thoroughly before use and usually replace the filter every 1 to 2 weeks. 3: The 20PCS humidifier filter rod can be used for a long time. Light weight, easy to pack and carry, doesn't take up much space. 4: It can make your working environment more comfortable, reduce stress, relieve dry skin and improve your work efficiency. Packing list: 20 pieces humidifier sticks