This is a genuine cyclone assembly for the Dyson DC07 upright vacuum cleaner. This component separates and filters out the incoming dirt and debris, so it conveniently collects in the dust bin. The cyclone is perhaps the most important part of this vacuum, maybe second only to the DC07 vacuum motor. If you ever notice a decrease in suction power, check the cyclone assembly for any hair or debris that may be obstructing airflow.