The KN95 Mask is a respiratory protective device designed to achieve a very close facial fit and efficient filtration of airborne particles.The KN95 designation refers to a filtration efficiency of greater than 95% for non-oily particles above 0.075 microns and the diameter of the new Corona Pneumonia Virus is about 0.1 to 0.12 microns. Therefore, wearing a Pacer KN95 mask in unison with other precautions can effectively help prevent the spread of the Covid-19 virus.The KN95 Mask is a disposable product with a lifetime use of between 5-8 hours. They should not be Shared or Reused!!Pacer is offering these in Packages of Six Respirators per pack.