The heavy weight of the HYPR Crossbow bolt delivers maximum penetration to crush big game with hard hitting kinetic energy and devastating knock-down power. Advanced Carbon Construction creates spine consistency for greater accuracy, exceptional reliability and repeat performance. Precision sorted for straightness to 0.003â?쳌 for maximum consistency. 20â?쳌 length fletched with 3â?쳌 vanes, 390 grains (With 100 grain point), 0.348â?쳌 Diameter, 6 per pack, inserted moon nocks.