With FDA EUA authorization and NPPTL-tested Powecom KN95 protective mask can be used by healthcare personnel legally. Powecom is one of the China manufacturers on the updated FDA EUA list. Tested by USA CDC and yields a filter efficiency of more than 99%. Comes in 10 pieces per pack, 100 packs per carton. Certificates: FDA-EUA-listed Note: FREE SHIPPING INCLUDED Price Includes: Free standard shipping to 1 US location