10-Pack PM2.5 Filters PM 2.5 activated carbon filter (5 layers), permanent household protective filter, effective non-woven cotton filter
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How To Wear Plug-in type, to provide you with double protection, with better protection effect
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Protective Qualities Five Layers Filter: 1) Non-woven fabric, 2) Meltblown cloth, 3) Carbon activated cloth, 4) Meltblown cloth, 5) Non-Woven Cloth.
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