The Clear Ballistics FBI Block is perfect for terminal ballistics testing for all handguns and rifles where penetrations are less than 16 inches. The FBI Block meets FBI ballistics testing protocol, and completely simulates the testing performed by the FBI. This block is the same size that the FBI and other law enforcement agencies use for terminal ballistics testing, and is perfect for hunters, hobbyist, semi-professional, professional shooters, and all types of law enforcement agencies.