This is a 3-armed white version replacement side brush used to prevent early failure of the side brush motor from excessive power requirements to turn the 6 arm brush, more durable than the previous red models.
Keep your iRobot Roomba operating at peak performance! The innovative Replacement Side brush for iRobot Roomba Professional Series Robots reaches deep into corners and edges to remove more dirt, dust and debris. Side brushes are easy to remove and replace as part of routine maintenance.