99% effective filtering nano masks are made of cop..

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99% effective filtering nano masks are made of copper nanoparticles | #Wearing of nano masks #Nano masks effectively filter #Washable Copper Knit Face Mask

99% effective filtering nano masks are made of copper nanoparticles

Masks made of copper nanoparticles can effectively filter 99% of harmful substances, can effectively reduce air pollution and allergens, and are more comfortable to wear.