Cleaning pen designed specifically for drones and filters Invisible carbon cleaning compound is lens-safe 2 in 1 Pen includes retractible brush and small polishing pad Helps remove dust, dirt, and oil Compatible with DJI Phantom 3, Inspire 1 and Solo Drones The PolarPro DronePen is a perfect tool to keep in your drone case. The DronePen provides 2 tools to keep your camera lens, filters, gimbal, and motors free of dust and dirt. One side of the DronePen includes a retractible brush perfect for brushing dust/dirt off of the gimbal and motors. The other side of the DronePen includes a small buffer pad with an invisible carbon cleaning solution which helps remove oil/dirt from the lens or filter. The DronePen will keep all of your Phantom3, Inspire 1 or Solo camera lenses and filters clean allowing you to capture crystal clear images.