Flex Fletch Flex Fletch Silent Knight Vanes 1207366 Neon Green. These 3? vanes are 30percent thinner than thermoformed vanes and have a lower profile that produces less drag and wind drift. 3 vanes have more surface area to produce more stability in flight allowing you to confidently shoot fixed-blade broadheads. Testing has shown an increase in velocity by 2 fps when compared the same arrows fletched with popular 2? thermoformed vanes. These vanes measure .485 high and weigh 6.8 grains. Specifications for Flex Fletch Flex Fletch Silent Knight Vanes 1207366: Manufacturer: Flex Fletch Color: Neon Green Features of Flex Fletch Silent Knight Vanes: Less drag & windrift 2 fps faster than 2" thermoformed vanes 30percent thinner with a greater taper than thermoformed vanes Reduced sound in flight Height: .485"/1.23 cm 6.8 grains Package Contents: Flex Fletch Silent Knight Vanes Flex Fletch SILENT36B-CGN: Flex Fletch Silent Knight Vanes 1207366 Neon Green