Crossbow Bolt Shafts with Balanced Weight and AccuracyThese carbon bolt shafts are built to a weight between the Swift and Nitro and offer straightness tolerance of plus or minus .005 inches and weight tolerance of plus or minus 2 grains with included inserts and nocks Carbon shaft construction Balanced weight profile Plus or minus .005 straightness tolerance Plus or minus 2 grain weight tolerance Includes inserts and nocks