It has been a while since I bought me a pipe, and I am looking for something new. I have been contemplating to buy a Dr Grabow - I know for most of you american folks it's a cheap nothing impressive pipe, but for us on the Old Continent it's simply something exotic. Not to mention, I would like to own one to remind me of the years I spend in the US. As I am looking at this brand on Amazon.de I keep seeing they have a special type of filter, which to the naked eye seems thinner and longer than your regular 9 mm filters. Can you guys educate me a tad on this subject please?