【ydmpro】 Replacement Cotton Swabs for Desktop Humidifiers - Cotton Swabs for Water Absorption, Freely Cuttable, Replacement Filters, for Ultrasonic Small Humidifiers, 8-Piece Set, Japanese Instructions ■Size 15.1cm x 0.8cm *Please measure the length of the water absorption core of your humidifier and cut it to the usable length. *Before using a new water absorption core, soak the entire core in water. The replacement period for the water absorption cotton swab is approximately "3-6 months" (when used for 4 hours a day). The replacement period may be shorter depending on usage and the environment. If the humidification amount of the humidifier decreases, please replace it regardless of the replacement period. 1. Remove the water absorption core. (There is a spring at the bottom of the cotton swab tube, so please do not lose the spring) 2. Insert the spring. 3. Insert the new water absorption core. 4. Attach it to the lid. I bought these as spares for my desktop humidifier, but the main unit broke, so I no longer need them. I used 2 out of 10, so there are 8 remaining. The main unit is not included. There are also the core rods and springs. If you need them, please comment. I will include them as a bonus.