Like 3 arrows in 1, the Mayhem series is engineered with K-360º Weave Technology to provide 360º spine consistency and deliver the ultimate combination of speed, accuracy, and penetration. The Mayhem Hunter also features exclusive Carbon Express Built-in Weight Forward technology for superior down-range accuracy with a broadhead. Equipped with Blazer Vanes for precise broadhead placement and BullDog nock collars for added strength. Straightness tolerance: ± .0035". Weight tolerance: ± 1.0 grain. Grains per inch: 8.9gpi w/250, 9.8gpi w/350. 6 arrows per pack.