40MM Spare GAS MASK Filter
Genuine 40mm military gas mask filters, these will fit all 40mm thread masks.
Filters seem good.
The ones I got are CFF3 filters.
Unfortunately these filters are really hard to lookup.
However they seem to be for the ARF-A French Gasmask.
However there's no reason to think they won't worth with the MP5 Polish Gasmask. As they're virtually the same thing.
They came in really good condition with many years shelf life left on them.