Fine point tips on marker pens allow for drawing accurate lines onto a workpiece. Using this kind of tip is advised when precision is of the utmost importance.
Chisel tip
Chisel tips have the benefit of being able to draw both thick and thin lines, depending on the angle at which you use the pen. These are ideal for all-purpose use.
Bullet tip
Bullet point tips have a slightly fuller, more rounded shape. They can be used to draw thick lines on to a surface.