Stable performance: stable and reliable performance, this filter keeps the humidifier with better performance. Super hygroscopicity: This filter has super hygroscopicity to prevent the humidifier from being by over-humidity. Easy to install: easy to install and replace, directly replace or broken. Suitable for: specially designed for HU4801 HU4802 HU4803 HU4811 HU4813 humidifiers. Reduce pollution: filter out the fine dust produced in the cleaning process, reduce secondary pollution to the air. Specification: Status: Project Type: Filter Size: Approximately 15 x 13 cm/5.9 x 5.1 inches Weight: Approximately 248 grams Colour: white Material: plastic Package Contents: 4 x filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.