ZERO Face maskBLS ZERO FFP3 face mask is a stackable disposable mask with high protection-FFP3 NR D. The maximum permeability at factor P3 is 1%.Easy breathingCup shape with an outer protective layerWith valveMORE INFORMATIONThe ZERO protective face mask is based on the EN 149:2001+A1:2009 standard for protecting the respiratory organs from viruses, hardwood, stainless steel, aluminum, asbestos, lead and others.