Huntingdoor 31" Archery Aluminum Arrows Recurve Bow and Compound Bow Aluminum Arrows for Practice or Hunting 12pcs 7075 Aerospace Alloy Material Aluminum arrow length: 31inch, Fletched with 4" parabolic vanes Aluminum insert installed with 100 grain replacement screw-in field point (8-32 Standard) Unique Safe Nock Adapter systems aligns the Nock directly with the arrow shaft to prevent blowout Replaceble plastic nock can be rotated to fit for your recurve bow or compound bow