HEPA filter is made of high-strength environmental-friendly materials, which can block most of dust down to 0.3 micrometer. The filter can maintain the cleaning performance of the sweeper, while reducing the penetration of dust, pollen and other allergens into the air you breathe HEPA filter is easy to remove and replace as part of routine maintenance, matching with the equipment, the filter element can be removed and flushed for easy maintenance, washed with warm water and reinstalled after it is completely dry. Simple to install, reliable to use, regular cleaning and replacement of the filter, can maintain the perfect performance of the vacuum cleaner and prolong its lifespan, HEPA filters help to clean the vacuum cleaner and make your lifestyle healthier. It is recommended that you replace spare parts every 2 to 3 months depending on the frequency of use to keep the machine running at its best performance The powerful cleaning function makes household cleaning more time-saving and labor-saving. It is suitable for a variety of floors such as ceramic tiles, marble, and wood floors. Model Number:For Roborock Flexi Pro /Roborock A20 Pro Colour:As Shown Material:plastic Package Contents: 2 * Roller Brush 4 * Hepa 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.