Feature●PFE (particulate filtration efficiency) ≥99% (0.1μm)●BFE (bacterial filtration efficiency) ≥99% (3.0μm)●VFE (virus splash filtration efficiency) ≥99% (3.0μm)●Size: Approx. 3.7 x 5.7 inches (9.5 x 14.5 cm); Quantity: 50 sheets●Material: Body: Non-woven polypropylene, Nose Fit: Resin, Ear Straps: Polyurethane (flat strings)Description
PFE (particulate filtration efficiency) ≥99% (0.1μm) BFE (bacteria filtration efficiency) ≥99% (3.0μm) VFE (virus spray filtration efficiency) ≥99% (3.0 μm) Size: Approximately 3.7 x 5.7 inches (9.5 x 14.5 cm) Quantity: 50 pieces; Material: Body: 50 pieces; Material: Body: Non-woven polypropylene; Nose fit: Polypropylene.