The 6.5 uses proprietary Acu-Carbon Uniform Spine process. 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. The Easton 6.5 includes NEW 6.5MM inserts that are made using a 4X-larger shoulder to add strength and boost valuable FOC.
These are what my bow prefers. They are about 1/3 lighter than the cheaper arrows, without the field points. When I cut them to length, I true the cut end in my lathe. There is minimal wobble on the fletched end so I know they are straight.