Carbon Express Mayhem 20in Carbon Crossbow Bolt - 6 Pack - The Mayhem Crossbolt is Engineered with advanced carbon materials to provide superior spine consistency plus deliver the ultimate combination of speed, accuracy, and penetrations. Innovative multi-layer construction has an optimal size dimeter and is tuned for today's high powered crossbows to deliver exceptional down-range accuracy and penetration with a broadhead. Precision-sorted for straightness and weight, creating maximum consistency shot after shot. Ultimate Versatility - Delivers ultimate combination of speed, accuracy, & penetration. Laser Match Set - Pack sets are sorted & matched by spine and weight for best-in-class consistency. Spine sorting tolerance +/- .0025in & Weight sorting tolerance +/- 1.0 grains. +/- .003in Real Straightness - Laser checked for straightness to remarkable 1/10,000 of an inch, our straightness standards are set as a max not an average like competitors. Universal Nock System - includes inserted moon nocks plus C-Nocks compatible with crossbows that use Capture or Alpha Nocks. 3in Dragon Vanes