The Pro Elite 400 20inch carbon crossbow arrow is fletched slightly offset and is fitted with a 61grain aluminum insert, 3.5• Bohning X Vanesâ and TenPointâ™s white AlphaNock and receiver for quick lighted nock installation. Pro Elite shafts are inspected for straightness to within .003 and handsorted for weight tolerance to within 2grains per dozen.Specifications:Straightness: .003"Grain Weigh Tolerance: +/ 2grain per packF.O.C.: 14%Vane: 3.5" Bohning XInside Diameter: .300Vane Color Varries