1. The innovative brush reaches deep into corners and edges to remove more dirt， dust and debris.It can be easy to remove and replace as part of routine maintenance.2. Filters maintain cleaning performance while reducing infiltration of dust， pollen and other allergens into the air you breathe. For best results， filters should be replaced every 2 - 3 months.4. Compatible : for 500/600 Series ( 536 550 595 564 595 610 620 630 640 650 660 670 680 ) Vacuum Cleaning Robots Package Included:3 x 6-Armed Side Brushes3 x Filters