рот маска прокладки анти пылевой фильтр рм2,5 anti-fog маска pad 3 layers mouth fagasket безопасности

mouth mask gaskets anti dust anti-fog mask pad 3 layers mouth fagasket safety.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.