Oblique nibs like OB or OBB produce a clearly more varied, calligraphically appearing script but require practice; the writing position must be adapted to the nib. For left-handers oblique nibs are not suitable. For fast writing over several hours, e.g. in exams, thin and well broken-in nibs like F or OM are better suited than very broad OBB nibs, since at speed and pressure legibility takes priority over script. Regular M nibs can also produce a calligraphic effect depending on grind. Important remains that the nib width fits one's own handwriting and writing strength.