Please recommend a fine dust mask that's cost effective

I bought a fine dust mask at the pharmacy and wore it.

The price range is stronger than I thought, and I think I will use it a lot in the future, so I will just buy a lot on the Internet and use it.

What would be good if you recommend fine dust masks based on cost-effectiveness?

I looked it up for a second and found that 3M was a bit expensive.

As long as the cost performance is good, small and medium-sized enterprises are also good.

355 2019-03-12 Gentleman

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