Flex-Fletch Glow in the Dark vanes have the glow fully integrated into our high-performance vane material. It's not a coating or paint. This allows us to use much more glow pigment for a glow that lasts a lot longer. Up to 8 hours! No need for a heavy, lighted nock to add weight to the back of your ar The flex-fletch series of vanes is world known for there unique ability to dampen the arrow oscillation, stabilizing the flight of the arrow quickly to give you flatter trajectory and better groupings. Our unique material and exclusive molding manufacturing process produces a vane with exceptional memory and durability. Fletching materials are not created equal. A fletching thickness, texture the wide base will cause deviations in performance.