Authentic Mask conforming to FFP2 class qualifies the following tests:- 1) Particulate Filtration Efficiency 2) Bacterial Filtration Efficiency 3) Breathing resistance 4) Inward Leakage 5) Flammability 6) Industrial Bacteria The mask is made up of five of the best quality protective layers whose specifications are as follows:- Layer one is 50 gsm non woven spun bond Layer two 25 gsm melt blown electrostatically charged Layer three again is 25 gsm melt blown electrostatically charged Layer four is hot air cotton Layer five is 25 gsm spun bond Best quality nose bridge and ear loop is also used during production. Mask is ultrasonically welded in a continuous production line by the machine and is not stitched by hand separately.