Authentic iRobot Parts - Roomba 800 & 900 Series Tangle-Free AeroForce Extractor Set Replacement set of AeroForce Extractors Brushless, durable rubber tread design grabs dirt from any floor type while reducing hair tangles and maintenance Replace extractors every 6 months to keep Roomba running at peak performance Compatible with all Roomba 800 & 900 Series Robots Authentic parts manufactured by iRobot