Hunting accuracy for shooter confidence is the cornerstone of Easton 6.5 arrows. The 6.5 uses proprietary Acu-Carbon Uniform 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. Product Specifications Size: 340 Shaft Weight: 9.3 GPI Stock Length: 31.75" Field Point: 5/16" O.D.: 0.298"