Weibestshop 100 Pieces Four Layer Disposable Charcoal Activated Carbon Mask Filter Antivirus Bacteria -- Each Piece Is Individually Packed Style:Ear-loop Soft,lightweight,Comfortable,Odorless Non-irritating to skin In clinical offices,housework,gardening and maitenance for filtering dust,pollen,and bacteria In laboratories and factories for blocking liquid mists,harmful airborne chemicals,and fine particle