Four

excellent filter, somewhat short for #4

It may be particular to my brewer's filter holder, but it was about . 5" short of the top of the holder, causing some grounds to overflow past the filter into the brewed coffee! I use medium pre-ground coffee from Fabula (no chaff, even 'sand' like texture) which had no overflow with my brown paper filter-56 grams of coffee. Probably an international difference in measuring on the manufacturers end. . . When i tried again with less grouns,no overflow, less brewed, but delicious!

Great filter

Works very well, quite happy with this filter

Not a Good filter

There is a lot o silt that goes through this filter compared to many other reusable metal filters.