Speed and accuracy of a small diameter with the durability and kinetic energy of a large diameter arrow 100% high modulus carbon fiber construction .204" ID small diameter shaft reduces wind drift and the SHOK SS insert system improves F.O.C. while increasing penetration Digitally spine aligned for increased accuracy and consistency Each dozen is matched weighted to +/- .5 grains for tighter grouping Advanced nano ceramic ICE coating improves penetration and also aids in removal from targets Weight: 300 spine 8.8 gpi | 350 spine 8.2 gpi | 400 spine 7.5 gpi | 500 spine 7.0 gpi Straightness: .001" Includes: SHOK SS insert (60 grains) Bohning A nock: (7 grains)