Managing how an arrow flexes in flight (Dynamic Spine) is the key to arrow accuracy, and no one does a better job at this than Carbon Express and the breakthrough Maxima RED shaft. The Dynamic Spine Control comes from the patented hi-tech carbon material construction that manages dynamic spine in a new way to make broadheads fly better. Maxima RED uses different carbon materials to control arrow flex to the RED ZONE, which is the section of the arrow shaft engineered to contain Dynamic Spine and make a broadhead shoot more consistently. Dynamic spine is managed so well it only takes two spine sizes to cover 40-92-pound bows. A broadhead moves the center of mass forward on an arrow, which increases the flex of the arrow when launched from the bow and causes this effect to act like wings on the front of the arrow. This results in tighter groups with broadheads and makes the Maxima RED the Ultimate Hunting Shaft.