General description This rubber multi-surface brush kit is designed for iRobot Roomba 800 & 900 Series Robot Vacuum Cleaners. It includes two rubber brushes that effectively clean various floor types and large surfaces, ensuring sparkling clean results. Technical specifications Compatible with iRobot Roomba models: 800, 805, 810, 820, 825, 830, 840, 850, 851, 860, 865, 866, 870, 871, 876, 877, 880, 885, 886, 890, 891, 896, 900, 920, 925, 930, 935, 940, 945, 950, 960, 966, 970, 975, 980, 985, 990 Material: High-quality rubber Usage One brush moves dirt while the other rotates in the opposite direction to effectively remove and vacuum debris. It is recommended to replace the brushes every 2-5 months for optimal performance and cleaning efficiency. Other information Kit includes: 2 light gray rubber brushes, 2 dark gray rubber brushes.