Huntingdoor 31" Archery Fiberglass Target Practice Arrows with Screw-In Tips for Recurve or Compound Bow( pack of 12) High quality fiberglass standard target practice arrows for recurve, compound, or long bows Colored plastic fletching & nock.rounded permanent nickel-plated stainless steel bullet tip perfect for target practice & beginners Nocked, fletched, tipped and ready to shoot .Rotatable Nock and replaceable Broadheads. Diameter:7.6mm.For draw weight of 35-65 pounds bows,the spine about 500. Key Features : Huntdoor fiberglass shaft has obviously rings ,they were made by kind of special process in order to transmit the force and protect the shaft agaist split when the arrow hit the target . Extraordinary durability for extended use