Have you ever counted how many balls once pouch contains?
Weight:: 1 Stack
Cost:: 1 gp
As an Action, you can spill Ball Bearings from their pouch. They spread to cover a level, 4-square-meter area within 2 meters of yourself.
Hazard: The affected area is considered Difficult Terrain.
Instability: Any Creature that enters the area for the first time on a Turn or begins their Turn in the area must succeed on a DC 10 Agility Saving Throw or fall Prone. On a Critical Failure it takes additionally 1d6 Bludgeoning Damage.
Recovery: Recovering the scattered Ball Bearings takes 10 minutes.