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By certification 
KN95 masks are absolutely high quality.
Prevent dust and spittle splashes: Wear this mask to protect you from dust, small particles in the air, pollen, etc. Reduce inhalation of the source of infection.
The KN95 mask isolates the respiratory system from external pollution.
Large quantities are cheaper.
For life safety and health, wearing KN95 mask is to respect and protect yourself and others.
http://www.thinkersupplier.com/
