The Hyperflight Crossbow bolts are Barnetts revolutionary small diameter bolt designed specifically for use with Hyper series crossbows. The power and speed of a crossbow combined with the precision and penetration of a .204 arrow deliver hits like you have never seen before. Straightness tolerance: .001”. 17.9% front of center for maximum downrange accuracy (with 100 grain field point). Small diameter arrow increases penetration by up to 62% compared to regular crossbow.