Today's nibs produce only a limited calligraphic effect, since stiffer nibs have been made since the introduction of the ballpoint in the 1950s to tolerate the typical writing pressure of users. Anyone who wants a real, clearly varying line should sensibly turn to an old, broken-in fountain pen with an OM or OB nib, or to pre-war models such as Watermans from 1900–1910 with flexible EF nibs. Current options for a light effect are Aurora Italic or Stub, the music nib of the OMAS Filarmonica, or the Calligraphique nib of the Cartier Louis Cartier. With Montblanc, an OB or O3B nib on the 149 produces a discreet line-width difference. Writing with flexible or oblique-ground nibs requires practice and the right grip on the pen.