The heavy weight of the HYPR-V 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 FeaturesLength: 20"Straightness Tolerance: 0.003"Inner Diameter: 0.300"Outer Diameter: 0.346"Grain weight tolerance: +/- 1.0