New sealed pair of model M44 NBC filters for the Avon M50 gas masks.  One plastic canister holds a pair for filters, sealed under the loose fitting plastic cap as can be seen in one of the photos.  Photos are for illustrative purposes only, this price includes one container which includes two filters.  Dates as shown (manufacture 2013, inspection 2018), they don’t go bad in their sealed containers.  You won’t likely find any “in date” replacement filters anywhere near this price, if you can find them at all.