dustproof kids pad 100 face original mask anti pm2.5 activate carbon filter replaceable m bgue

100 pad kids famask dustproof anti pm2.5 fit for k kf94 2 1 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.