pm2.5 pm2.5 маска замена fliter углерод вставка 5 слоев защитные одноразовая маска inner колодки дышащий

disposable isolation fine mask pad for mask replacement protective breathable pad replaceable anti dust mask 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.