10Pcs Mini Portable Personal USB Humidifier Replacement Sponges Refill Stick 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: Material: Filter cotton Color: 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.