CIMC LLC 5-Pack iRobot Roomba 880 3-Arm Side Brushes Replacement for iRobot Roomba Robotic Vacuum Parts Compatible with iRobot Roomba 800 Series 5 pack Side Brushes for Roomba 800 Series 3 Armed 880 870 Replacement iRobot Roomba 880 3-Arm Side Brush Replace side brush every 2 to 3 months for best performance The Brush allows your Roomba to reach deeper into the carpet for a more thorough cleaning