new, high-quality materials, well-made, , and highly matched to the equipment. Clean accessories enable your home robot to maintain optimal performance. Accessory contents are easy to remove and replace as part of routine maintenance. All while reducing dust, pollen and other from seeping into the air you breathe. In order to achieve the best cleaning and filtration effect, cleaning accessories should be replaced every 2-3 months according to the frequency of use. The main function of the roller brush of the sweeping robot is to clean dust and debris on the ground. When the roller brush rotates, it can push dust and debris on the ground to the suction port, allowing the robot to clean the floor more effectively. Type:Sweeper accessories Quantity:4PCS Colour:As Shown Material:Plastic Package Contents: 4 * Sweeper roller 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.