TenPoint EVO-X Alpha-Blaze CenterPunch16 Premium Carbon Crossbow Arrows, 3 Pack 16" modulus carbon fiber construction w/Lazer-Tech carbon weave 400 grains +/- 1-grain per pack weight tolerance 84-grain aluminum insert, 17.5% F.O.C. .001" straightness tolerance Inside/outside diameter: .297"/.348" Slightly offset 2.1" Q2i Fusion-II vanes 8 hours of runtime for illumination, can be turned off without tools Lighted Alpha-Blaze nocks with HP Aluminum Bushing