Carbon Express 50686 Maxima Hunter Arrow with Dual Spine Weight Forward Technology and Blazer Vanes, 350-Sized Mossy Oak Camo Pattern Shaft, 12-Pack Dual Spine Weight Forward technology manages energy better, recover faster, spin 20% sooner, retain more speed and deliver unparalleled accuracy Back shaft section made with patented BuffTuff Plus carbon weave construction for spine consistency, strength and durability 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 Items specifications: 350-Size, 8.9-GPI, 0.337-inch Spine and 0.297-inch Diameter 12-pack of "Mossy Oak Treestand" camouflaged pattern arrows are sorted and matched by weight and spine for best-in-class consistency