Re: Which KM?
As previously stated, trimetals are more solid and more likely to be brass cored (whether that is actually beneficial is debatable, however). Trimetal refers to more than just the 'standard' trimetal design. The term 'trimetal' is also used to describe pharnies, copper hearts, copper pearls, al gia styles, etc etc. Any of the models with brass copper and stainless steel are TRImetals. Dualmetal models like the ma'shal are also supposed to be fairly sturdy (no personal experience, but this is what I hear). But all KMs, save the small ones that thehookah sells, are the same gauge and smoke accordingly.