For rollerballs of the Classique size, that is the model 163, Montblanc refills come in four colours — blue, black, red and green — but only in the M width. In F only blue and black are available. For the larger LeGrand rollerballs the range is confined to blue and black, again in M and F. It should be borne in mind that the LeGrand refills write appreciably broader than those of the Classique series: a LeGrand M lays down a line closer to a Classique B, and a LeGrand F closer to an M.
The refills are made by Schmidt Feintechnik, a supplier who offers a distinctly wider range of colours under its own name. These outside refills cannot simply be used, however: their rear end is shaped rather differently and is longer, and they lack the thread by which the Montblanc refill is screwed tight in the barrel. Without modification they therefore will not fit the Classique rollerballs. This describes the position as of 2007; the choice of colours may have changed since.