30 PC's face mask PM 2.5 carbon activated filters

New Adults and kids size available 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;