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 Product Specifications LENGTH 20 STRAIGHTNESS TOLERANCE - .003 INNER DIAMETER - .300 OUTER DIAMETER - .346 GRAIN WEIGHT TOLERANCE - +/- 1.0