The word precision is synonymous with the very new 3M 9004 IN safety mask. This safety mask comes with sophisticated electret media filter protection and eases respiration. The outermost layer of the safety mask filters out large dust particles, the innermost layer keeps the shape of the respirator, and the middle layer is made up of electrostatic filter media. It can filter above 90% of 0.3-micron particle dust, like a respirator mask or anti-pollution face mask.