Lieto Copper fiber Reusable Mask *Principle of Copper Material Operation Step 1. Copper ion invades into the cell membrane of bacteria Step 2. Cell membrane is damaged by infiltrated copper ions, resulting in cell material leakage Step 3. Proliferation inhibited by the leakage of proliferating substances, which are plasmid and DNA. 99.9% of bacteria damaged within 2 hrs. (Extermination) *Why Copper Material? Anti-bacterial & sterilizing function Deorforization 99.9% inhibition of Pneumococcus 99.9% inhibition of Staphylococcus Eco textiles Anti-static Kills the virus within the particles *Copper Mask Feature -Washable & Reusable -Anti-bacterial & sterilizing function -Full protection -5 layers (Sample purchases can be made regardless of quantity.) (Price negotiation is possible based on quantity of purchase.)