Excalibur ProFlight 18in Carbon Crossbow Bolts - 6 Pack - Constructed using the highest quality carbon fiber with .001in straightness and +/- 1 grain weight tolerances, ProFlight Arrows will ensure repeatable accuracy which is everything for confidence and success. 250 Grain Arrow weight .001in straightness tolerance +/-1 grain weight tolerance 2in Blazer vane with a 3 degree offset White cresting allows for easy shot placement verification Equipped with Rhino Nocks Compatible CeaseFire Technology crossbows or any that utilize flat-back nocks