The Carbon Express Maxima RED 4mm is a micro-diameter hunting arrow designed for tight groups and consistent broadhead control at extended ranges. Its RED Zone with Tri-Spine Technology manages dynamic spine through the shot cycle for faster recovery and cleaner steering. The 4mm profile helps reduce wind drift and supports deeper penetration, while 360 degree spine consistency promotes uniform shaft-to-shaft performance. Straightness is rated to +/- 0.002 inches max with a +/- 1.0 grains weight tolerance for repeatable accuracy.