The Crossbow Discharge Arrow includes a 20-inch carbon arrow with an installed Alpha-Nock HP, HP Aluminum Bushing, discharge collar, and field tip. The 650-grain finished arrow with an Alpha-Nock, is designed for use on most crossbows that shoot a 20-inch arrow. The Alpha-Nock HP can be used in any 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.