I felt ripped off when I bought three of these cartons expecting 72 of the paper mask filters in each box as the label implies-------- 72 EA/Case [PRICE is per EACH]There are small boxes with only 6 of these disposable filters that can be used a few times at most. It becomes an expensive alternative. The filter isn't particularly more sophisticated to make than a coffee filter. I also had trouble finding these anywhere. So now after I dropped all this cash I'm looking at other types of personal protection equipment for dust.The mask/respirator works great and you need to replace these filters frequently. But there are other brands and types of dust protection. How can you advertise 72 in a case and then deliver 6.BOGUS!