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About this item 【HIGH QUALITY MATERIAL】These activated carbon filters are 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 EXTRA PROTECTION】2 Anti-sticking cloth, 1 Filter cloth, 1 Activated Carbon and 1 Efficient filter cloth as in picture. Multiple protection to isolate dust, multi-layer folding, good ventilation, double your protection with an additional filter. 【BREATHABLE AND COMFORTABLE】The disposable air filter replacement contains efficient activated carbon, effectively prevent dust from entering your mouth and face, but allowing you to breathe normally. 【WIDELY OCCASSION】Activated Carbon Filter anti airborne particles dust, smoke, pollution, ash, gardening pollen and so on, suitable for most occasions, perfect for gardening, running, cycling, travel, household,schools, and other outdoor activities etc. 【PACKAGE CONTENT AND NOTICE】Comes with 50 Pieces PM 2.5 Activated Carbon Filter which is more cost-effective and suitable for sharing with family, friends and neighbors. Note: 1. Filter insert can not be cleaned and should be replaced every 2-3 days. 2. When film or sticky sediment stains emerge, please replace the filter. No Description