1. As part of regular maintenance, the accessories are easy to remove and replace. They help reduce the infiltration of dust, pollen, and other particles into the air you breathe. 2. For optimal cleaning and filtration performance, it is recommended to replace the cleaning accessories every 2-3 months, depending on usage frequency. 3. The filter captures dust, dirt, and other impurities drawn in by the sweeping robot, helping to keep the robot clean and functioning properly. It also prevents dust and debris from entering the motor and internal components, contributing to extended device lifespan. Material: Nylon Package Contents: 4 x Main brush 2 x Filter 1 x Cleaning brush Only the above package content is included; other items are not part of this package. Note: Lighting effects and monitor settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.