Finnish M61 Gas Mask Filters, These are the Grey Finnish M61 Gas Mask Filters which measure 60mm in diameter on the screw thread attachment.
The internet says these will fit the US M9, Canadian C9, and Finnish M/61 Gas Masks
Vintage Filters ex reserve stock from the 1980's, all made of metal and feel lovely and solid.
( These won't fit the British S10 and its variants. )
Great for display, cosplay, fetish etc, Price is for ALL 8 Canisters. Filters are Not Sealed in packaging.