It's PM2.5 air mask breathing filters.Replace the fliters every week of uses,but need to according to your actual situation.Protect your mouth and face from gases, noxious smells, pollen, smoke, dust and other harmful particles.
For Adult mouth mask insided with fliter.
Size:10 x 7 cm/3.94 x 2.75 inch
Package include: 40 PCS PM2.5 filters
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