Flex Fletch Glow Vanes. Made from super-durable polyurethane these vanes are both 100percent water and weatherproof ensuring that you can find your arrows even in low-light conditions after a long day of shooting. Not only do they charge quickly under sunlight or UV light but they also contribute to arrow stability and accuracy with their renowned ability to dampen arrow oscillation. Specifications for Flex Fletch Glow Vanes: Manufacturer: Flex Fletch Color: Green Features of Flex Fletch Glow Vanes: Set of 36 Glow in the Dark Vanes Glow Duration: Up to 8 hours with quick sunlight/UV charging Waterproof and Weatherproof Material: Durable polyurethane Function: Helps stabilize arrow flight for better accuracy Dimensions: Length 2.0 inches Height 0.485 inches Weight: 4.6 grains Origin: Made Package Contents: Flex Fletch Glow Vanes