1. Derwent Graphik Line Marker: a popular choice in line marker pens for the professional artist. Comes in three colours: black, grey and brown; and nibs vary in size for intricate detail.
Disadvantages: draw a line too fast and the ink stops flowing; sometimes it is too scratchy when drawing; in terms of weight, the pens are very light and small in size.
2. Staedtler Pigment Liner: a reliable choice for line drawing and intricate detail, the ink is solidly black, however, you also have to draw lines slowly with this one. The pen varies in its line size. Long-lasting, affordable and durable, this pen remains a popular choice with artists and graphic designers alike. Waterproof on paper, too.
3. edding profipen: similar characteristics to the Staedtler Pigment Liner, except its ink is bolder. So, if you are looking for a stronger black, this pen will do the job.
4. Uniball eye rollerball pen (fine line): Produced by the Mitsubishi Art, this cheap and durable pen produces the fastest free-flowing blackest lines without losing its ink-flow. This makes it suitable for use as a handwriting pen. The best thing about this pen is not its fluidity, but it is the fact that the ink is waterproof (many line markers are water-resistant). The only disadvantage with rollerball pens is that the ink is too fast-flowing for slowly-drawn intricate detail.
5. Rotring isograph: This stylus will give you a solid black line with its rollerball-like nib. However, in the last thirty years, Rotring has polarised artists with its new range of expensive art pens and its once-waterproof ink (making it ideal for watercolour painting) is now water-resistant. The downside with all Rotring pens is its use of art cartridges. In the first place, before replacing the cartridge, you are meant to clean the pen’s barrel by running it under the tap to prevent clogging. You can buy plastic Rotring ink bottles to fill the cartridges, but it’s a pointless exercise. I could go on....