The MMG's, MG/SE, MG12 and 1.6 do NOT use ribbons!
Well alright, Magnepan calls it a "quasi-ribbon" design. I was trying not to get too awfully technical, but note that in their description of the technology they do actually use the word "ribbon":

The Quasi-Ribbon shown is basically the same driver used for the mid and low frequencies of the Magneplanar speaker with the infusion of a heavier gauge wire replacing the thin aluminum ribbon. Using a .0005" Mylar diaphram and a .001" ribbon this diapole, cabinetless design leaves the sound absolutely un coloured by box resonances.
But hey whatever.