... ,safe use suitable size: 175 x 93 mm, 3 layers, filter paper inside Non-woven mask---efficient resister to N1H1 virus product ... ,safe use suitable size: 175 x 93 mm, 3 layers, filter paper inside packing: each unit packed in a polybag, with 1 ... -2 color design printing 50 pcs/paper box, 4 boxes/ctn MOQ: 300 ctns (600,000 pcs ...