These are great value black fibre tip pens from Aristo. The GeoCollege Pigment Liner Pen uses lightfast waterproof pigment ink - great for technical work and sketching and drawing.
The GeoCollege Pigment Liner tube point is made of high-grade steel for fine accurate lines. Ideally suited to drawing with a ruler and with templates. The ink flows smoothly and evenly and the pens are colour-coded for the different line widths of 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.7 and 0.8mm.