Description:The filter cotton sticks is compatible for all humidifier diffuser. You can sheare in shorter you need. Effective foam filter will enable a pure stream of water steam to freshen the air, which will ensure your ability to breathe more comfortably. Features:Compatible for USB water bottle caps humidifier. Made of filter cotton material , good absorbed and quarity. Effective foam filter will enable a pure stream of water steam to freshen the air, which will ensure your ability to breathe more comfortably.Porosity distribution; absorbent particularly strong, water storage capacity, volatile stability. Not water-soluble, non-stick blocking, to maintain the consistency of volatile agent speed.Can be sheared in shorter you need. Directions for replacement:1) Unscrew the water tank cap 2) Pull out the filter plastic part(notice the sprint on the bottom) 3) Pull out the filter and replace the new filter 4) Pull in the filter plastic part(notice the sprint on the bottom) 5) Screw the water tank cap   Specification:Condition: 100% Brand New Material: Filter cottonColor: White Size: (Dia.) x (H) 7 x 130mm / 0.28 x 5.12 in (appr.) Packaged included: 10 x Filter Cotton Sticks Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures. Features Sufficient Quantity:: you will receive 10 pieces of white cotton humidifier, size: 7 x 130mm, sufficient quantity to meet most of your needs; practical tools for office, room and travel. Cotton Material::Our humidifier filter wick is made of high quality cotton material, and is characterized by good water absorption. You can soak in water without worrying about deformation and pilling. So you can enjoy a good condition and get a good mood. Good Water Absorption:: the humidifier filter rod is characterised by good elasticity, even pore distribution, strong water absorption, good storage capacity and evaporation stability. Filter Change:: humidifier cotton filter pens should be replaced after 3 to 4 months depending on use and water quality. Maintain the frequency of replacement appropriately and regularly to make spraying clearer and achieve a better filter effect. Use:: humidifier wicks are easy to remove and attach to humidifiers. Complete the process within seconds. Please allow a filter pen to soak completely wet before inserting it into the humidifier. It is recommended to use tap water and not to drip into essential oils to be soaked (if necessary, adding a small amount of essential oil is acceptable).