Material: Humidifier stick is made of high quality cotton material,good absorption,which is insoluble in water and not easy to stick. Size: Cotton filter sticks are about 10/4 inch in length,and 0.7cm/0.3 inch in diameter,package include 20pcs,enough for your daily need. Easy to install: The removing and installing of humidifier wicks are very simple,please soak the filter stick until it is completely wet before inserting the humidifier. Protect your humidifier: When you find that the humidifier produces less steam or even stops working,and the machine is getting hotter, please try to replace the filter, don’t worry about the humidifier’s service life (usually 1 to 2 weeks to change the filter) Wide use: Humidifier filter stick is the practical tools for office,room and travel use,allowing you to enjoy a nice condition and bring you a good mood.