Check the listing for details. 10Pcs Cotton Filter Sticks humidifier stick White 3.94" x 0.39". Color: White, Condition: New. Listed at 12.82 USD. This filter cotton stick is used as a water filtering medium for cool mist humidifiers, USB-powered Mini humidifiers, etc. It's recommended to replace the filter stick after using it for 1 - 2 months based on the usage and water quality. By replacing the filter stick regularly, it will bring your humidifier a better filtering effect and make the spray clearer, allowing you to enjoy a nice atmosphere in your home, office, or car and bring you a wonderful day.Specification：Color: WhiteMaterial: Fiber CottonOverall Size: 100 x 10mm/3.94 x 0.39inch(L*D)Packing List: 10 Pcs x Cotton Filter SticksAdvantage：1. The humidifier cotton stick can be freely cut, you can cut the appropriate length according to your humidifier.2.