Graphos R-nibs are mainly used for technical drawing.

Before use the wire has to be removed from the tube, afterwards it is put back into its place to avoid the tube being plugged by ink residues.

Graphos O-nibs create even strokes, just like the Round Nibs.

Graphos A-Federn create very thin lines and are mainly used for technical drawing.

Graphos T-nibs have a straight cut nib tip and are used for broad strokes and poster script fonts.