Before purchasing, keeping in mind what they are intended for. Keeping dust out, or any other large particles, possibly while cleaning, etc. Pretty good deal. They are not N95 or higher though, so don't expect it to keep viruses such as flu or even the common cold out. It can possibly stop spit droplets from someone sick sneezing on you, so I guess its better than nothing. Also, when buying all those disposable N95 masks or any mask, it's only as good as how well you wear them. If there is not a good seal, then it wont be very effective. I'm no expert, just based on some research.
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