dhl ship[mask gasket] 3 ply gasket face mouth dust filter active carbon for facial guard mask pad pm2.5 f

[mask gasket] 3 ply gasket for famouth dust for facial guard mask pad for kf94 z.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.