kn95 маска для лица n95 защита маски для лица с дыхательным клапаном многоразовый нетканый пылезащитный фильтр рот-муфель такой же, как kf94

material: 5 layers filter function: 1.the first layer: spunbond cloth, filter the dust of micron 2.the second layer: to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies 3.the third layer: activated carbon cloth, benzene and a smaller function of filtering dust microns 4.the fourth layer: filter density, smaller material 5.the fifth layer: spunbond cloth, filter out all kinds of harmful substances; feature: n95 mask can isolate smaller particles, and...