Crossbow bolt featuring bone-crushing penetration heavy grain weight creates maximum kinetic energy and greater knock-down power. Advanced construction ensures spine consistency for greater accuracy. The composite material is extremely durable at impact for exceptional reliability and repeat performance. Sorted for straightness to +/- 0.004 In., for repeat maximum consistency (maximum measurement, not an average). Includes inserted Moon nocks, 6 universal nocks, and 6 C nocks.