The Spartan was developed from taking the best characteristics from larger 19/64 and smaller 17/64 shafts. We wanted the Spartans outside diameter to be small for maximum accuracy and penetration. However, like larger arrows, we wanted the 100% carbon Spartan to utilize an insert for easier arrow removal and to reinforce the front of the shaft for bone-shattering impacts. FEATURES: .001& .003 Straightness or Straighter 1 Grain Weight Tolerance 32 Shaft Length SHAFTS INCLUDE: Black Eagle Arrows R Nock - 9 Grains Spartan Stainless Steel Nock Bushings - 10 Grains Spartan Stainless Steel Inserts Inserts - 26 Grains Required: Points, Vanes