Weighing 410 grains, the 20-inch precision spine-indexed Pro Elite 400 Select increases accuracy by 33%, delivering tighter groups while maintaining the same point-of-impact as the standard Pro Elite 400 Carbon Arrows. Product Features The arrow is equipped with the patented Alpha-Nock HP, which features a deep bowstring groove, a large smooth radius base, and elongated ears. The crossbow string wraps tightly around the center of the Alpha-Nock HP, resulting in straight nock travel and precision down-range accuracy, while minimizing serving wear. Each arrow is inspected for straightness to within .001 and each package is weight-grain matched within 1-grain per arrow. (The Alpha-Nock HP can be used in any railed TenPoint, Wicked Ridge, or Horton Crossbow Innovations crossbow. Use of the Alpha-Nock HP 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.) Product Specifications Nock Alpha-Nock HP Length 20" Weight 410-grains (+/- 1-grain) Straightness .001" Vane Q2i Fusion X-II 3.0 F.O.C 13% Insert Weight 58-grain Aluminum Insert Inside Diameter .300 Outside Diameter .346 Crossbow Compatibility Most TenPoint and Wicked Ridge Crossbows