одноразовая маска pad изоляция анти-мутность пылезащитный дышащий замена одноразовые рм2,5 маски фильтра ватным тампоном

disposable mask pad isolation anti-haze dustproof breathable replacement cotton pad features: 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.