1. Brushes are easy to remove and replace as part of routine maintenance. 2. For best results, brushes should be replaced every 1 to 3 months. 3. For use with for 800 900 Series only. Vacuum Cleaner Part Type: Brushes Model Number: Sweeping Robot Accessories Type: Vacuum Cleaner Parts Color: Photo Color Material: Plastic Package Contents: 6 x Main Brush Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.