FFP2 face mask with active carbon and valve in good quality and competitive price FFP2 face mask made with valve and active carbon 3/4 layers: non poisonous, non-allergic, non-stimulate materials, adjust the bandages strip and the built-in bandage foam cushion to adapt to various face shapes.conforms to FFP2 standard, free of maintenancepacking: 20pieces/box, 20boxes/carton. disposable face mask