The Carbon Express Mayhem offers COMPLETE performance of speed, accuracy, and penetration. The advanced design uses proprietary K-360¦ Weave Technology for remarkable strength and spine consistency, and more importantly, provides the most accurate arrow in its class. For those that choose fletched arrows, the Carbon Express Mayhem featuring Blazer vanes for added velocity along with BullDog nock collars for improved durability. Patented BuffTuff« Plus K-360¦Ö Woven Construction - Excellent strength and spine consistency for complete performance.á BlazerÖ or FusionÖ Vanes - Added velocity and precision broadhead placement. BulldogÖ Nock Collar - unrelenting strength and durability for nock end impacts. Straightness: ¦ .0035". Weight Tolerance: ¦ 1.0 grain. Spine Selection Tolerance: ¦ .0025".