одноразовая маска рот 3 слоя non-woven пыль роты обложка pad рм2,5 фильтра активировать углерод взрослого ребенок одноразового

disposable mouth mask 3 layer non-woven dust mouth cover pad adult child disposable 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.