Old threaded pipe cone-piece screwed into a nice-ish section of bamboo with a carb drilled in the side. Also has some steel scourer inside so I'm not charging ash into my lungs.
Technically that's not a steamroller. A steamroller has both ends open. That has a choke so it's kinda like a bowl... i guess. But it's still bad ass. I had a chillum I made from a bamboo pipe in art class back in the day. It was awesome.
Not bad to smoke actually, with a little bit of a steel scourer halfway down the tube it produces a very dense warmish smoke free of "hot rocks".