dhl ship7e2gp anti-dust reusable in with breathing valve k face mouth pm2.5 filter active carbon washable mask pad m

7e2gp pm2.5 anti-dust reusable in with breathing valve k famouth washable mask pad m u.1.the first layer: high efficient filter cloth filter the dust of micron.2.the second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.3.the third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.4.the fourth layer: activated carbon cloth filter density, sma.