Main purpose: timely replacement can improve the cleaning efficiency and protect the engine. The recommended replacement period is 1-3 monthsMain material: Rubber Main Brush can help you solve most cleaning problems, and the HEPA filter can effectively help Robot Vacuum Cleaner collect dust.Applicable model: For iRobot Roomba S9 S9 Plus Robot Vacuum CleanerAbout the accessory description: Dust bag can be used as long as there is Clean Base, please rest assured to buy. Rubber Main Brush is also very efficient for cleaning carpets, wooden floors,tilesColour:Photo ColorMaterial:plasticPackage Contents:1 set x main brushes6 x side brushes8 x filters1 x cleaning brushOnly the above package content, other products are not included.Note: Light shooting 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.