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By certification 
There are 50 masks in the sanitary dispenser box: our 3-layer sanitary mask is housed in a sealed plastic shrink box.
3-layer filter protection: our 3-layer mask contains advanced PP non-woven filter layer
Easy to breathe and comfortable to wear: the three-fold mask can be extended from the nose to under the chin to closely fit the face.
Suitable for most workplaces: our essential personal protective masks are worn in the most common working environment in the world.
http://www.shengnuo-medical.com/
