The replacement pre-filter is only available for CordZero A9 series toothless vacuum cleaners. The filter's rubber ring adheres tightly to the plastic frame, sealing it completely while maintaining airflow, so that dust does not enter the suction motor through the drip filter. The vacuum filter is made of high-quality material, washable and reusable. The HEPA filtration system captures and seals 100% of pollen and fine particles as small as 0.1 Micrometer, such as smoke, dust, etc. We recommend replacing the filter for at least 1 to 3 months depending on the amount of dust collected by the vacuum cleaner. Color: Green Material: Plastic + Cloth Package Contents: 4 Filters Only the above package content, other products are not included. Not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.