Product Description 10pcs per box (All individual packages) 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 Qualifications BFE & PFE & VFE 99.9% ASTM Level 3 EN149:2001+A1:2009 FFP2 ISO14644-1 Class7 ISO13485:2016 Minimal Essential Media (MEM) Elution Test Microbial Cleanliness (Bioburden) Test