Maintain your robotic cleaner and make sure you get the desire cleaning results, by changing your filters and brushes regularly you keep your robotics filtration level and pick-up performance over time. This kit contains everything you to take care of your RX9. 2 for over a year New filters ensures the filtration level and pick-up performance sustains over time. The side brushes ensures the robot catches the fine dust in corners and crevices. The main brush is designed for all types of floors and carpet giving you optimal pick-up of dust and debris for an impeccable result.