FFP2 grade 3/4 layers face mask with or without valve Conforms to FFP2 grade, BFE>98%Folding, with valve or without valueMade with 3/4 layers, non poisonous, non-allergic, non- stimulate materialsWith adjustable bandage strip and built-in foam cushion to adapt to various face shapes.Applicable in construction, mining, textile, grinding, medicine.Packing: 20 pcs/box, 20 boxes/carton non-woven face ...