These are a set of ten (10) hard-to-find replacement filters for the Neomask Neoprene Carbon Mask. These filters will keep unwanted and potentially dangerous airborne particles from entering the airways and thus eliminate the risk for harmful bacteria and pollutants to enter the body. Do not risk your health! Replace your filters to keep your Neomask working properly and efficiently! These filters come in a heavy resealable plastic pouch (with sealing slider).