I missed an entire Grabow thread? I'll be back after work. Modern Grabow are all filtered and have ABS plastic stems, except for the Royalton line which comes with acrylic. Many of their pipes run on the smaller side chamber wise but as likely noted earlier in a post I haven't read they do have larger ones if you look. Think my biggest and smallest pipe are both Grabow. The Freehand have decent chambers and filtered vulcanite stems. The Big Pipe is the same. The Hillcrest line used larger blocks too and came with filtered vulcanite or acrylic. Then there's the Unique line, all handmade, massive, and virtually impossible to find due to such a limited number having been made.