Carbon Express Maxima BLU RZ Carbon Arrow Shaft with RED Zone Technology, 12-Pack BEST OF BOTH WORLDS - The Maxima BLU RZ arrow combines the same world class, lightweight speed and accuracy of the Maxima BLU Streak Select with the breakthrough broadhead accuracy of the Maxima RED . HIGH TECH - The BLU RZ is made with Carbon Express' proprietary Diamond Weave carbon material, and features a high-tech carbon shaft designed with stiffer ends that isolate the arrow's flex in the middle of the shaft: the RED ZONE. LIGHTWEIGHT PERFORMANCE  Great choice for bowhunters who want maximum kinetic energy and accuracy and who shoot a lighter draw weight. ITEM SPECIFICATIONS: 250-Size, 7.45-GPI, 0.413-inch Spine, 0.291-inch Diameter, and 31.5" length. MATCHED SET - 12-pack of finished shafts are sorted and matched by weight and spine for best-in-class consistency