A breakthrough design in controlling dynamic spine promotes better arrow flight and improved broadhead accuracy. Different stiffness and weight properties over the length of the shaft work together to contain the flexing of the arrow to the InchRed Zone Inch. Features a straightness tolerance of +- .0025 Inch. Available in sizes 250 (.410 Inch spine, 8.3 GPI) and 350 (.341 Inch spine, 9.0 GPI). Includes LaunchPad precision nocks, inserts, and BullDog collars. All sizes use 19/64 Inch points. Factory fletched with 2â?쳌 Blazer vanes.