20-INCH / 410-GRAINS (+/- 1-GRAIN) / BALANCED AT 13% FOC / .001a ^2 STRAIGHTNESSWeighing 410-grains the 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.The 20-inch arrow features a 3a ^2 Q2i Fusion X-II Vane fletching and is equipped with a 58-grain aluminum insert providing a 13% F.O.C. (Front-of-Center balance). The Alpha-Blaze provides bright illumination at the shot and the same point of impact as our unlighted arrows.The Alpha-Blaze Lighted Nock contains a one-piece Nock/LED unit that is indexed with the vanes and press fits into the arrow's Aluminum Bushing. Upon firing the crossbow the bowstring's force compresses the two pieces and activates the lighted nock.Deactivate the easy on/off Alpha-Blaze lighted nock by pulling the nock straight out until the light turns off - no tools required. The LED light of the Alpha-Blaze system lasts for approximately twenty-four hours when activated.(The Alpha-Blaze can be used in any railed TenPoint Wicked Ridge or Horton Crossbow Innovations crossbow. Use of the Alpha-Blaze 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.)Each arrow is inspected for straightness to within .001a ^2 and each package is weight-grain matched within 1-grain per arrow. 20-inches 410-grains (with inlcuded 100-grain field point) 3a ^2 Q2i Fusion X-II Vanes .001 Straightness Weight-grain matched to within 1-grain per arrow. Alpha-Blaze Lighted Nock