рм2,5 маски фильтра обновления одноразовая маска pad для non-woven замена универсальная защитная дышащий soft pad заменяемое

pack disposable mask pad for non-woven replacement universal protective breathable soft pad replaceable 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.