Carbon Express Maxima RED Carbon Arrow Shaft with Dynamic Spine Control, 12-Pack LAUNCHPAD PRECISION NOCK - Launchpad Precision Nocks come standard on all Maxima RED arrows and shafts to deliver a controlled arrow release, better shaft alignment and more consistent accuracy shot after shot. DYNAMIC SPINE CONTROL - 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. REAL STRAIGHTNESS - Laser checked for straightness to a remarkable 1/10,000 of an inch; Straightness of +/- 0.0025-inches is a maximum measurement, not an average ITEM SPECIFICATIONS: 250-Size, 8.11-GPI, 0.417 spine, 0.295-inch Diameter, 31.5" length, and a weight tolerance of  1.0 grain MATCHED SET - 12-pack of red and black finished shafts are sorted and matched by weight and spine for best-in-class consistency