otring isograph Junior set comprises 3 isograph pens, 1 Tikky mechanical pencil (0.5mm), and 4 isograph ink cartridges.
The isograph is the classic steel-nibbed technical drawing pen, familiar to several generations of draughtsmen. The isograph features a refillable ink reservoir, and a patented push-on sleeve gives easy access to the ink helix for cleaning, even when the ink reservoir is full. Line widths for drawing as per ISO 128 and DIN 15, and for lettering per ISO 3098/1 and DIN 6676.
Sets contain the following isograph pen sizes:
Set A - 0.1, 0.2, 0.3
Set B - 0.2, 0.3, 0.5
Set C - 0.25, 0.35, 0.5