1. Brushes are easy to remove and replace as part of routine maintenance. 2. For best results, brushes should be replaced every 1 - 3 months. 3. For use with 800 900 Series only. Vacuum Part Type: Brushes Model Number: Sweeping robot accessories Type: Vacuum Cleaner Parts colour: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 the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.