N95 grade face mask,respirator, Conforms to N95 standard, BFE>98%with valve or without valveMade 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.Paking:20pcs/box, 20 boxes/carton surgical face mask with 3/4 layers