The XX75 20-inch 2219 aluminum arrow is fletched slightly offset and is fitted with a 13-grain aluminum insert 2.0 Easton Bully Boattail Vane and TenPoint s white Alpha-Nock. The Alpha-Nock can be used in any TenPoint, Wicked Ridge, or Horton Crossbow Innovations crossbow. Use of the Alpha-Nock in any of these crossbows will not void the warranty, even if your crossbow originally required the use of a flat nock or Omni-Nock. Nock Alpha-Nock Straightness .003" Grain Weight Tolerance +/- 2-grains per dozen Weight 435-grains F.O.C 9% Vane 2" Easton Bully Boattail Vane Inside Diameter .305 Sold Individually