Crystal Pilot Clip On Cloud-overs are lightweight, clip-on visors that attach to any prescription eyeglass or sunglass frame in seconds. When flipped up they instantly provide for the perfect instrument-to-visual transition, and when flipped down create a near perfect simulated instrument condition. Cloud-overs clip onto your kneeboard for easy storage, and can be attached for use in seconds. Their dark plastic lenses make cheating difficult in the cockpit, and are manufactured for flexibility and durability. Cloud-overs are widely accepted by FAA approved Flight schools for use in practical tests and checkrides. Hard EVA carrying case is also included with the Cloud-overs so that you can safely store them when not in use. Designed by Crystal Pilot, the world's most innovative aviation design bureau. Crystal Pilot Clip on Cloud-overs are lightweight, clip-on visors that attach to any prescription eyeglass or sunglass frame in seconds. When flipped up they instantly provide for the perfect instrument-to-visual transition, and when flipped down create a near perfect simulated instrument condition. Cloud-overs clip onto your kneeboard for easy storage, and can be attached for use in seconds. The dark plastic makes cheating difficult in the cockpit, and are manufactured for flexibility and durability. And perhaps best of all, Cloud Covers are widely accepted by FAA approved Flight schools for use in practical tests and checkrides. Made in China.