·Acu-Carbon™ Uniform Spine USA Manufacturing Process for the highest level of accuracy. ·Microlite Nocks—shortens the critical distance between the shaft and bowstring for improved alignment and reduced weight. ·6.5MM Inserts—precision machined component has four-times larger shoulder. Strengthens the broadhead/arrow interface and boosts F.O.C. ·Bully™ Vane Fletching—stiffer material for superior control and quiet arrow flight. ·Match Grade ±.001” ·Spine size: 300 9.5 gpi