Carbon Express Mayhem Fletched Carbon Arrows with Blazer Vanes, 6-Pack Arrows come Fletched with Blazer Vanes, LAUNCHPAD Precision Nocks and BullDog Nock Collars (vane and nock color may vary from image) Features K-360 Degree Weave Technology -patented process that integrates a carbon weave into the back section for added strength and spine consistency Laser checked for straightness to a remarkable 1/10,000 of an inch; Straightness of +/- 0.0035" is a maximum measurement, not an average Item specifications: 250-Size, 8.9-GPI, 0.410-inch Spine and 0.299-inch Diameter 6-pack of black finished arrows are sorted and matched by weight and spine for best-in-class consistency