The Crossbow Discharge Arrow includes a 20-inch carbon arrow with an installed Alpha-Nock, discharge collar, and field tip. The 725-grain finished arrow with an Alpha-Nock, is designed for use on most crossbows that shoot a 20-inch arrow. It can also be used on most crossbows requiring flat, moon, or capture nocks. 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.