9mm Blanc

9mm blank cartridges (9mm Knall, 9mm P.A blanc)
These are cartridges without projectile, but with a chemical composition (powder) in it.
Their are recognizable by their green head (standard blank pattern for semi-automatic pistols), but are available in other versions.
Blanks are usual used for example at, film recordings, military training, dog training, or re-enactment.