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By certification 
Pack of 5 multi-layer high-filtration protective masks. 5 masks
The adjustable and formed integrated metal nose bridge clip provides a comfortable and customized fit, and can be used continuously for several hours to reduce discomfort or irritation.
The multi-layer structure provides up to 95% filtration efficiency, exceeding the standard cloth mask.
Made of soft, highly flexible filter material with built-in elastic earrings, suitable for adults and children-One size fits most people.
http://www.shengnuo-medical.com/
