Features: Filtration Technology: 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. 5 Layers Protection: 5 Layers protective material filters can effectively prevent air pollution protection.  Reasonable 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. Description: Material: non-woven Size: about 12*8cm/4.7*3.1inch Package included: 60 pcs Activated carbon filter  Warm tip:  The mask filter replaced steps:  1. Open the mask to expose the interior of the filter valve.  2. According to the OPEN directions on the valve, turn the valve counter, to separate the valve.  3. Remove the filter.  4. Replace the new filter, iterate the above steps, rotation of the valve, over.  
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