Description: Color: Black, Pink Size:  28 * 13 * 0.2cm Material: Sponge Package List: 5 * Mask/ 10 * Mask Notes: 1, Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 2, The filtering effect of N95 mask is of course the best, but even the worst performing gauze mask can achieve close to 80% protection for particles above 10 microns, that is, about one tenth of the hair diameter. In America, there is a randomized experiment involving 2800 personnel, confirm that no significant difference in the infection rate of influenza between wearing N95 masks and medical masks.
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2 months ago
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