Our Long Range Block is perfect for terminal ballistics testing for all handguns and rifles where penetrations will exceed 16 inches. The Long Range block meets FBI ballistics testing protocol 100%, and completely simulates the testing performed by the FBI. This block is larger than our stander FBI block by almost 75%, most ammunition companies, Firearm Company use a bigger block then normal for terminal ballistics testing and data, this size of a block will give you more of a surface area to aim at and hit. Our Long Range Block was sized for semi-professional, and professional shooters, and law enforcement agencies. Note: This synthetic gel should only be used for ballistic testing. It is not suitable for medical applications.