Pack of 500 PROCEDURE BLUE MASKS is intended to be worn by health professionals during surgery and during nursing to catch the bacteria shed in liquid droplets and aerosols from the wearer's mouth and nose. The high density filters in this Disposable Face Mask block out dust, soot and smoke, keeping your lungs healthy, your body energized and your mind sharper and clearer. Packaged: 50 Per Box, 10 Boxes Per Case, 500 pcs in total per case.