Compatibility: Replacement Brush for iRobot Roomba 800 & 900 Series 860 861 865 866 870 871 880 885 886 890 900 960 966 980 Robot Vacuum Cleaner. High Performance: This brush for 800 made of high quality rubber, soft and flexible, better contact with the floor or carpets. This set works as well as the original, with precise fit and easy installation. Efficient Cleaning: This roller brush accessory for 900 fits all types of flat floors. Dual multi-surface shaped roller brushes capture dust, debris, pet hair, and more more effectively. Highly Efficient Technology: Unique multi-surface rubber brushes won't tangle with pet hair. Brushes for 900 & 800 adjust and flex to stay in constant contact with carpets and hard floors. Value Pack: 4 sets of roller brush accessories for iRobot 900 & 800 Series. (Note: There may be some noise when the rollers are first used, but it will disappear after a while of use.)