Nightmare Xtreme Crossbow Bolts are constructed from 100 percent carbon to provide consistent straightness and dependable performance. The 20 inch bolt design balances speed and penetration while maintaining stability at high velocities. Each bolt is built with tight straightness and weight tolerances to support repeatable accuracy. Inserts and half moon nocks come installed for ready-to-use setup and reliable compatibility with crossbows rated up to 500 fps.