This bolt features a balance of speed and penetration. It is the perfect crossbow bolt for all hunting situations. Constructed of 100% Carbon which gives the Nightmare Xtreme unmatched quality and straightness shot after shot. Straightness Tolerance: +/- .003" or better You have an option of 20" or 22" at checkout Weight Tolerance: +/- 2 gr Inserts Included and installed Red Half Moon Nocks Included 20" Bolts 284gr - 22" Bolts 301gr