Easton Hunter Classic 6.5 500 Spine Arrows, 2" Bully Vanes, 6 Pack 6.5MM Inserts (23 grains) Microlite Nocks-shortens the critical distance between the shaft and bowstring for improved alignment and reduced weight. Acu-Carbon(TM) Uniform Spine USA Manufacturing Process for the highest level of accuracy. Bully(TM) Vane Fletching-stiffer material for superior control and quiet arrow flight. 500-Spine Length: 28.5" Straightness A .003" Outside Diameter: 0.287" GPI: 7.3 6 Pack