Compatible model:The filter is suit for X50 Ultra Complete, L50 Pro Ultra, X50 Master, L40s Pro Ultra vacuum cleaner.Please confirm your robot model before purchase Packages:There are 6 filters and a cleaning brush Function:This filter with strong capabilities to filter up to 99.9% of the dirt, pollen, small dust particles and substances Reusable:The filter can be washed, and reused after dry, to keep your robot operating good, we recommend to replace the filters every two or three months Satisfactory service:Thank you for supporting on us, if you have any questions about the product, please contact us first, we will reply within 24 hours to help you solve any problems Compatible model:The filter is suit for X50 Ultra Complete, L50 Pro Ultra, X50 Master, L40s Pro Ultra vacuum cleaner.Please confirm your robot model before purchase