20pcs per box (All individual packages) Size in 16.7w x 14.3h cm All production process are manupulated in Hong Kong. Dustproof, water proof and comfortable. Specially designed for Hong Kong people to wear. Breathable for wearing a longer period. No latex No glass fiberQualifications BFE & PFE 98% ASTM LEVEL 2 AC:2019 Type IIR EN14683:2019 ISO 14644-1 Class 8