Carbon Express products are engineered with innovation, precision, and performance to fulfill its promise of allowing you to “Shoot Better.” The Mayhem crossbolts offer ultimate versatility in speed, accuracy, and pentration through engineering and advanced carbon materials that provides superior spine consistency. Its innovative multi-layer construction has an optimal size diameter and is tuned for today's high-powered crossbows to deliver exceptional down range accuracy with a broadhead. Every 6 pack of bolts comes with inserted moon nocks and an additional 6 universal flat nocks. Each bolt is precision sorted for straightness to ensure shot after shot consistency (straightness: +/- 0.004")