Product Name: Kn95 Ffp2 Mask Protective Anti-Dust Masks Mouth Face Mask Protection N95 Level Mask 99% Filtration Anti Fog Gas Flu in Stock Model NO.: KN95 Product Description about N95 masks:N95 mask can isolate smaller particles, and fit tighter to the face, it is not easy to leak air from the periphery, and the filtration efficiency of particulate matter can reach 95% under standard conditions. * The n95 mask is not a disposable mask. In this special case (resource shortage), it can be reused. But there are conditions: * 1. When n95 receives contamination such as saliva, blood, tears and other body fluids, it must be replaced * 2. The user obviously feels that the breathing resistance is greater than before and must be replaced * 3. Masks are damaged and must be replaced * 4. It is recommended to replace it after using it 4 times. * However, masks cannot be reused if people go to the hospital, come into contact with an infected person, or are suspected to be infected.5 Layers Filter function:* 1.The first layer: spunbond cloth, filter the dust of micron * 2.The second layer: to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies * 3.The third layer: activated carbon cloth, benzene and a smaller function of filtering dust microns * 4.The fourth layer: filter density, smaller material * 5.The fifth layer: Spunbond cloth, filter out all kinds of harmful substances;