Easton BTV Crossbow Vanes 3 in. Yellow 100 pk.. Stiffening ridge cuts flutter at high speeds and increases accuracy and tightens broadhead groups. They are 3" in length and have a .500" profile and weigh 10 grains. Package Contents: Easton BTV Crossbow Vanes Height and profile designed for high powered crossbows. Stiffening ridge cuts flutter at high speeds and increases accuracy and tightens broadhead groups. They are 3 in length and have a .500 profile and weigh 10 grains.