Lightning Strike LS7 Matched-Weight aluminum crossbow arrows have the same features as the Lightning Strike, but measure 17 inches, specifically for use with the Horton SteelForce recurve crossbows. LS7 arrows with vanes are designed for target shooting, finished with low-profile helical vances. For best broad head performance, use LS7 arrows with feathers. Available in 6 and 72-packs. Length: 17″. Weight (with 100-grain point): Vanes: 341 grains. Straightness Tolerance: .003 at 17″.