Easton Bowhunter 6.5 300 Spine Arrows, 2" Bully Vanes, 6 Pack CB Inserts (21 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. Straightness A .005" 300 Spine Length: 28.5" Outside Diameter: 0.30" 6 Pack