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shipping in 24 hours 10pcs anti pollution kn95 mouth mask dust respirator disposable face mouth masks mouth earloops masks about kn95 masks: kn95 mask can isolate smaller particles, and fit tighter to the face, it is not easy to leak air from the periphery, and the filtration efficiency of particulate matter can reach 95% under standard conditions. the kn95 mask is not a disposable mask. in this special case (resource shortage), it can be reused. but there are conditions: 1. when n95 rece...