Bohning Black Sky Vane 2 in 100 Pk Black. 0 Crossbow Vane is designed for crossbow bolts to stabilize them for up to 100 yards. It?s made of an ultra-stiff material that prevents vane flutter for a smooth bolt rotation and a quiet flight. The Black Sky Vane?s ultra-stiff material is durable enough to withstand the high velocities of modern crossbows. Recommended to use an instant glue and/or a fletching jig with high adhesion force. Features of Bohning Black Sky Vane: 2.0? (50.8mm) in length 0.53? (13.5mm) in height Average 6.1 grains (395 mg) weight Pre-primed for optimal adhesion. Package Contents: Bohning Black Sky Vane Bohning 10902BK2: Black Sky Vane 2 in 100 Pk Black