FFP1face mask with valve with good quality and competitive price FFP1 dust face mask with valve made with 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 FFP1 standard, free of maintenancepacking: 20pieces/box, 20boxes/carton. disposable face mask