Specifications:_x000D_
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-50 pieces ( €0,50 piece ) _x000D_
-Suitable for face masks with a filter opening_x000D_
-The filters are 5-layer with activated carbon filters_x000D_
-Protects you by blocking 98.2% non-oil-based particles in the air._x000D_
-The filter will last 5 to 7 days - then discard_x000D_
-Do not use while sleeping_x000D_
-Not suitable for children under 2 years old_x000D_
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How do I use the filters?_x000D_
Wash your hands. Place the filter through the openings on the side in the mouthpiece. Make sure the filter is completely flat.