Nano masks from Czech republic. The disposable face masks offer easy breathing face thanks to the 3 original layers of nanomaterials. Efficiency against viruses and bacteria 99,9% (level FFP3)in two ways inside and outside (tested from Nelson Labs Utah,USA) Certificated from EU(CE).Price(1,5 Euro per piece).Original invention and producer from Czech republic,created in the Czech republic, protected by a patent.''Permeability of air 200l/m2/sec.'Our company represent a producer and we are able to guarantee the same price.