Hunting accuracy for shooter confidence is the cornerstone of Scheels Outfitters 6.5MM Arrows. The 6.5 uses proprietary Acu-CarbonUniform Spine process. Acu-Carbon is a continuous-fed, single-die manufacturing method that results in the most reliable tolerances and eliminates the need for the spine-alignment and weight sorting. Easton's Acu-Carbon production line produces the most consistent spine and weight from dozen to dozen and lot to lot-year in and year out. This benefits the bowhunter with truer flight and pinpoint accuracy in the field. Details: 6 Pack Premium AAE Hybrid 26 Vanes Helical Fletch Straightness .003 GPI: 250: 9.9 gpi 300: 9.5 gpi 340: 9.3 gpi 400: 8.4 gpi