The TenPoint Non-Lighted Pro Elite 400 Carbon Crossbow Arrows are fletched slightly offset and fitted with a 58-grain aluminum insert, 3.5-inch Bohning X Vanes, and TenPoint’s Alpha Nock HP Nock and Alpha Nock HP Nock Bushing. The Pro Elite shafts are inspected for straightness to within 0.003 inches. It comes in a pack of 3.Alpha-Nock HPTenPoint’s Alpha-Nock HP features a deep bowstring groove, a large smooth radius base, and elongated ears. The Alpha-Nock HP’s deep channel design increases the string-to-nock engagement by 28 percent and ‘holds’ the bowstring in place during the shot, which prevents 'shoot-over' or ‘shoot-under’.HP Aluminum BushingIts HP Aluminum Bushing increases strength and accuracy. The string on TenPoint’s extremely narrow crossbows wraps tightly around the center of the Alpha-Nock HP, resulting in straight nock travel and precision down-range accuracy while minimizing string serving wear. Compatibility of Alpha-Nock HPThe 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 an Omni-Nock. | TenPoint Non-Lighted Pro 400 20-Inch Long 0.03-Inch Straight Carbon Crossbow Arrows (3-Pack) in Black.