Replacement Humidifier Filter : Cotton swabs are used to filter out impurities in the water to circumvent clogging the air outlet, and take up water to atomize and convey mist; it is strongly recommended to replace it every two months! 1:These are cotton swabs for humidifiers , you possibly can lower the suitable length to your humidifiers 2:10 pieces cotton swabs in each equipment the above kit content, other merchandise aren't integrated