16PCS Replacement HEPA Filter for Combo J7+ J9+ Robotic Vacuum Cleaner HEPA Filters Accessory Kit 2. Clean accessories enable your home robot to maintain optimal performance. Accessory contents are easy to remove and replace as part of routine maintenance. All while reducing dust, pollen and other from seeping into the air you breathe. 3. In order to achieve the best cleaning and filtration effect, cleaning accessories should be replaced every 2-3 months according to the frequency of use. 4. The function of the sweeping robot filter is to filter dust, dirt and other impurities inhaled by the sweeping robot to keep the robot clean and running normally. The filter also prevents dust and dirt from entering the robot's motors and other parts, extending the robot's lifespan material: plastic Color as shown Package Contents: 16 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.