The most accurate crossbow arrow ever, the CenterPunch 20-inch arrow is fletched slightly offset and is fitted with an 84-grain insert and TenPoint s Aluminum or white Alpha-Nock. Constructed from modulus carbon fiber at 33 MSI (million-pounds-per-square-inch) and wrapped in an exclusive LAZER-TECH carbon weave, it is fletched with 3.5" Bohning X Vanes . CenterPunch arrows are inspected for straightness to within .001 and each package is weight-grain matched within 1-grain per arrow. Price shown is for one arrow. Product Specifications Nock: Aluminum Alpha-Nock, White Alpha-Nock Straightness: 0.001" Grain Weight Tolerance: +/- 1-grain per pack Weight: 445-grains F.O.C : 17% Vane: 3.5" Bohning X Inside Diameter: 0.297 Outside Diameter: 0.348