Stanwell 9mm activated charcoal pipe filters are made in Bremen, Germany, and come in packs of 10, 40, 100, or 200. They provide a cooler, drier smoke, while keeping your pipe burning more steadily and evenly. In addition, they take nothing away from the taste of your tobacco!
Pipe Nook Notes
I personally only use charcoal filters once, to get the most pristine, unaffected taste possible from the tobacco. However, I've been told that others have good luck with drying out charcoal filters and using them up to 4 times before throwing them out. Your mileage may vary. All of the charcoal filter brands I stock perform very similarly and very well, and I recommend them all. I like to have as many brands available as I can, in case any of them run into supply shortages.