The heavy weight of the HYPR-V(TM) 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 +/- 0.003″ for maximum consistency. 20″ length fletched with 3″ vanes, 390 grains (With 100 grain point), 0.348″ Diameter, 6 per pack, inserted V-Track Nocks LENGTH – 20″ STRAIGHTNESS TOLERANCE – .003″ INNER DIAMETER – .300″ OUTER DIAMETER – .346″ GRAIN WEIGHT TOLERANCE – +/- 1.0