The Big Blast Cap Target Inflator is a fun way to use a non-explosive target that merely operates by air pressure. With a Big Blast Cap you can pump air into a plastic bottle. Umarex recommends up to 80 psi depending on the weather and size of the bottle. You place it down range at least 60 away and shoot it with a projectile. The pressurized air immediately disperses to normalcy creating a "boom" as the air molecules rush out into the normal atmospheric pressure.