The price of $45.00 is for five sealed filter. Surplus M44 Gas Mask Air Filter Canisters. M44 canisters all still sealed in original issue hard plastic containers. Rated for Chemical agents. Standard 40MM NATO threads so they can be used on almost any type of gas mask. Authentic US military issue. SN 4240-01-361-1319. These are perfect for the auto painter respirators or someone in the business of working with hazardous chemicals such as lawn service, tree sprayers. I have numerous filters so if you are interested in a quantity of more than five please contact me through eBay and I can create a But it Now listing for you. Five filters are 6 to 7 pounds, to include packing, to ship. Thanks for looking!!!