Description Overview Three layer of filtration High elastic ear straps, automatic welding Folded structure, curved three dimensional protection Specifications Material: SMS - spunbond + meltblown + spunbond Size: 175 mm x 95 mm Filtration efficiency: BFE 90% Packaging Package: 50 pcs per box, 2000 pcs per carton Carton size: 770 mm x 410 mm x 330 mm Weight: 11 kg per carton