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 and receiver for quick lighted nock installation. 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 to within 1-grain per arrow. - Nock: Aluminum Alpha-Nock - Straightness: .001 - Grain Weight Tolerance: +/- 1-grain per pack - Weight: 445-grains - F.O.C: 17% - Vane: 3.5 Bohning X - Inside Diameter: .297 - Outside Diameter: .348