Iff this helps at all, now im a newbie of two weeks, i have an Aerotank mega, it comes with a dome shaped stainless steel mouthpiece, which i found cold and actually possibly dangerous of chipping my immaculate teeth, Lol, so i took a small portion of 5 or 6 or 7 mill clear hose from hardware store, and slipped it over the mouthpiece, cut it to size. Cost 50 cents, and now it has a nice rubbery feel, that i can sink my teeth into, and vape safely.