Tenpoint Evo-x Carbon Arrows 20 Metal Product Details 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