Tenpoint Evo-x Center Punch 16 Arrows 6 Pack 16-INCH / 400-GRAINS / BALANCED AT 17.5% FOC / .001" STRAIGHTNESS Specifically designed for the Havoc RS440 and the Siege RS410, the CenterPunch 16-inch arrow is fletched slightly offset and is fitted with an 84-grain insert and TenPoint’s white Alpha-Nock. Constructed from modulus carbon fiber at 33 MSI (million-pounds-per-square-inch) and wrapped in an exclusive LAZER-TECH carbon weave, it is fletched with 2.1" Q2i Fusion-II Vanes. CenterPunch arrows are inspected for straightness to within .001 and each package is weight-grain matched within 1-grain per arrow. Available in a 6-pack with White Polymer Alpha-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.