10pcs per box (All individual packages)(Dark Grey) Size in 208x81mm , Open：175x110mm Breathing Resistance 2.4mmH2O All production process are manipulated in Hong Kong Dustproof, water proof and comfortable Carefully select hypo-sensitive materials Specially designed according to Hong Kong people's face shape and with adjustable nose bridge Excellent permeability No latex No glass fiber Please refer to the package for the expiration date Keep it under the cool and dry places