This listing is for 1 box. The 3MTM 1860 AND 1860S Health Care Particulate Respirator and Surgical MaskS are NIOSH approved as a Type N95 respirator to meet OSHA requirements and CDC guidelines for TB exposure control. The model 1860 may be used during laser surgery, electrocautery, and other procedures involving powered medical instruments. Intended to help reduce wearer exposure to airborne particles in a size range of 0.1 to > 10.0 microns generated during these procedures. Fluid resistant to provide .99% BFE against microorganisms and help reduce potential contamination and exposure of the wearer to the spray, spatter, and aerosol of blood and body fluids.(20 masks per box