The Carbon Express Mayhem series is engineered to deliver the ultimate combination of speed, accuracy, and penetration - setting a new standard for all-around Hunting performance. It's like getting 3 arrows in 1. The secret weapon is the K-360¦ Weave Technology that provides 360¦ spine consistency and delivers the ultimate combination of speed, accuracy and penetration. The Mayhem Hunter also features our exclusive Carbon Express Built-in Weight Forward technology for superior down-range accuracy with a broadhead. For those that choose a fletched arrow, the Mayhem Hunter is Equipped with Blazer vanes for precise broadhead placement and BullDog nock collars for added strength. Innovative Built-in Weight ForwardÖ Technology - Superior down range accuracy with a broadhead. Patented BuffTuff« Plus K-360¦Ö Woven Construction - Excellent strength and spine consistency for complete performance. BuffTuff« - World's toughest carbon arrow finish in Mossy Oak« ObsessionÖ camouflage pattern. BlazerÖ or FusionÖ Vanes - Added velocity and precision broadhead placement. BulldogÖ Nock Collar - unrelenting strength and durability for nock end impacts. Straightness: ¦ .0035" max.á Weight Tolerance: ¦ 1.0 grain. Spine Selection Tolerance: ¦ .0025".