ProWorks KN95 Respirator Half Mask provides respiratory protection against particles. For non-medical use only Fits comfortably on the face and helps prevent pollutants from entering the mask 5 layer construction Adjustable ear loop Enclosed adjustable metal nose clip Foldable, easy to carry Inner packed 2 per bag for easy and safe distribution Pack: 2/cellophane pack, 25 pks/box, 10 bxs/case (500 ea/cs total) Standards:KN95 standard: GB2626-2006 (Personal Protective Equipment) ProWorks KN95 Respirator Half Mask provides respiratory protection against particles: Filtration Efficiency:GB2626-2006 section 6.3: ≥95%; Airflow: 85 L/Min; Aerosol: NaClExhalation Resistance:GB2626-2006 section 6.6: ≤250 Pa; Airflow: 85 L/MinInhalation Resistance:GB2626-2006 section 6.5: ≤350 Pa; Airflow: 85 L/Min