5 Layers Protection: 5 Layers protective material filters can effectively prevent air pollution protection.
Size: Filters size measures approx. about 12*8cm/4.7*3.1 inches, compatible with most dust masks, easy to insert or replace the original one with no problem.
Good Design: Multiple protection to isolate dust, multi-layer folding, good ventilation, double your protection against nasty substances, gases and odors with an additional filter inserted into the inside of your pollution mask.
Wide Applications: Mouth mask filter anti airborne particles dust, seasonal allergies, smoke, pollution, ash, gardening pollen and so on, suit to most occasions.
Material: Made of activated carbon and non-woven melt-blown filter cloth, five-layer filter system effectively keep away from PM 2.5 and a range of airborne contaminants.