New Ultrasonic Aroma Humidifier (SHIZUKU model only) Antibacterial Cartridge, Part Number ACA-002 One cartridge (approx. 6 months supply) I purchased this at the end of the year, but I accidentally bought the wrong cartridge for my humidifier. If anyone uses the 【SHIZU KU】 humidifier and would like this, I'm happy to give it away. The outer box is slightly torn from opening, but the contents are brand new and in perfect condition.