Thefeatures a three panel flat fold design which gives a comfortable fit to most face sizes and head shapes. This standardization allows use in the operating room, for patient care, and throughout a health care community. NIOSH-approved as a Type N95 respirator to meet OSHA requirements and CDC guidelines for TB exposure. Fluid resistant to help reduce potential exposure of the wearer to the spray and spatter of blood and other body fluids. A 99% Biological Filtration Efficiency to help reduce patient contamination caused by exhaled microorganisms. Sold 20 individual packages per box.