Our 20% NATO Ballistic Gelatin Block is the perfect medium to test a variety of projectiles terminal performance. As its name suggests, this gelatin block is specifically produced to meet NATOs 20% gel standards for ballistic impact testing, which stops projectiles much sooner than 10% gelatin blocks do. In contrast to other available ballistic gelatins, our gel stays clear through multiple impacts and iterations of melting/reforming. This means that you can use and reuse our blocks multiple times without losing the ability to see a projectiles impact as well as its temporary and permanent wound cavities. This 20% synthetic gel block is formed into the same dimensions as the blocks used by law enforcement agencies across the country and the world: 16 inches long, by 6 inches tall, by 6 inches wide. Beyond bullets, this block is ideal for testing any type of puncture weapon and yields consistent, realistic results. Note: This synthetic gel should only be used for ballistic testing. It is not suitable for medical applications.