Originally Posted by Coyotero
I believe all the KM hookahs now have stainless inner stems. I have an older Pharonie with a copper one, but it shouldn't make much of a difference (Although I'd swear the copper smokes cooler.)
I had a no-name pipe with a copper stem, and I would have to agree about the cooler smoke.
Also, stainless is great too. I think maintenance is key, and as long as it's kept up on, I've found very few problems at all with any of my pipes.