1. new, high-quality materials, well-made, , and highly matched with the equipment. 2. Clean accessories keep your home robot at its best performance. As part of daily maintenance, the accessories are easy to remove and replace. At the same time, reduce the infiltration of dust, pollen and other into the air you breathe. 3. In order to achieve the best cleaning and filtering effect, the cleaning accessories should be replaced every 2-3 months depending on the frequency of use. 4. The function of the sweeping robot filter is to filter the dust, dirt and other impurities inhaled by the sweeping robot to keep the robot clean and operating normally. The filter can also prevent dust and dirt from entering the motor and other parts of the robot, thereby extending the service life of the robot. For N20 / N20 Plus / N20 Replacement Slight differences in accessories do not affect use Colour:As Shown Material:Plastic Package Contents: 1x main brush 4x side brush 4x filter 4x Mop Cloth 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.