The iron balls were hand grenades made by Jin Feng. Although he had interned at a military industrial unit in his previous life, his work mainly involved mechanical aspects and not the specialized study of explosives.
Therefore, Jin Feng only knew some of the ingredients used in gunpowder but didn't know the precise ratios. He had to experiment and learn through trial and error.
Unlike flashbangs, which might cause temporary blindness at worst, gunpowder is a high-level hazardous material that could explode if mishandled. Jin Feng had to be extremely careful during his experiments.
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