http://www.facemaskmanufacture.....com/face-mask-with- Face Mask With Valve Free Sample Valve kn95 medical mask can prevent 95% of non-greasy particulate matter from a certain degree of protection against viruses and bacteria, but any mask can not prevent 100%. It is recommended to reduce the amount of going out as much as possible. Pay attention to drinking more water, ventilating frequently, washing hands frequently, and keeping the indoor environment hygienic, so as to achieve the normal effect of improving own resistance. Wear a mask of level KN90 or higher as much as possible when going out. Material of 5 layer KN9
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