EASTON 6.5 HUNTER CLASSIC ARROWSThe 6.5 uses a proprietary Acu-Carbon Uniform Spine process. Acu-Carbon is continuous fed single die manufacturing method that results in the most reliable tolerance and eliminates the need for the spine alignment and weight sorting.TECH SPECSSize: 340GPI 9.3RPSPoint: 5/16"Straightness: +/-.003