Replacement iRobot Roomba 585 Bristle Brush, Flexible Beater Brush - Kit Includes 3 Bristle Brush, 3 Flexible Beater Brush Replacement iRobot Roomba 585 Bristle Brush, Flexible Beater Brush The Brushes allows your Roomba to reach deeper into the carpet for a more thorough cleaning Replace brushes every 2 to 3 months for best performance Please check your Roomba to make sure you are purchasing the correct parts On Sale for a Limited Time!