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 Three Respirators per pack. NOTE!! - Due to the Covid-19 Crisis Inventory is constantly under strain. We understand how important these masks are to you and are working diligently to keep up with demand. Pacer will make every effort to ship orders within 2-14 days from receipt of order. Order yours today for best delivery date. Stay Safe and Be Well!Pacer