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. All Maxima RED 12-pack sets are sorted and matched for best-in-class consistency with a Spine selection sorting tolerance of +/- 0.0025-inches and a weight sorting tolerance of +/- 1.0 grains. Every shaft is laser checked for straightness to a remarkable 1/10,000 of an inch so you know the Maxima RED straightness of +/- 0.0025-inches is a maximum measurement, not an average. The LAUNCHPAD Precision Nocks deliver a controlled arrow release, better shaft alignment and more consistent accuracy shot after shot. These shaft"s are designed with the “BullDog” Nock Collar to protect the shaft against nock-end impacts. The Carbon Express 50751 Maxima RED is sold as a 12-pack of shafts. Items specifications: 250-Size, 8.11-GPI, 0.417-inch Spine and 0.295-inch Diameter. To gain the advantage in the field, you need the best equipment, which is why so many hunters, competitors and enthusiasts insist on the Carbon Express brand.