Made with bacterial filitration suitable for a number of settings, these masks meet ASTM standards for resistance, differenential pressure, filter efficiency, and flammability. Widened, highly elastic earbands for ease of use. Anti-fog sweat band across bridge of nose for added comfort. Material(s): Polypropylene; Size Group: One Size Fits All; Airborne Contaminant Resistance: Bacteria; Quantity: 40/Carton.