Those who use any of iRobot's family of Roomba robotic vacuum cleaners know and love how simple it can be to maintain a tidy, welcoming home. Compatible with all 500 series Roombas with a red or green cleaning head (sold separately), this robust kit provides replacement bristle brushes to keep the cleaner in good working order. Includes three bristle brushes with end caps and bearings. Flexible beater brush with bearings are sold seperately.