The PolarPro DronePen is a perfect tool to keep in your drone case. It provides 2 tools to keep your camera lens, filters, gimbal and motors free of dust and dirt. One side includes a retractable brush perfect for brushing dust/dirt off of the gimbal and motors. The other side of the pen has a small buffer pad with an invisible carbon cleaning solution which helps remove oil/dirt. The DronePen will keep all of your Phantom 4, Phantom 3, Inspire 1, Solo, or Yuneec camera lenses and filters clean allowing you to capture crystal clear images.