The innovative multi-layer construction of the Carbon Express Mayhem Crossbolts has an optimal size diameter and is tuned for today's high-powered crossbows to deliver exceptional down-range accuracy and penetration with a broadhead. Ultimate Versatility - Delivers ultimate combination of speed, accuracy, and penetration. Laser Match Set - Pack sets are sorted and matched by spine and weight for best-in-class consistency. Spine sorting tolerance +/- .0025" and weight sorting tolerance +/- 1.0 grains. +/- .003 Real Straightness - Laser checked for straightness to remarkable 1/10000 of an inch. Universal Nock System includes inserted moon nocks plus C-Nocks compatible with crossbows that use Capture or Alpha Nocks. 3" Dragon Vanes. Available in 20" and 22" bolt lengths.