What is special about these wires?
The wire is extremely thin (0.25mm) and the insulation is fairly heat resistant this helps a lot when soldering the wire, the insulation doesn't just melt away for these reasons this wire is extremely useful for PCB rework.
When building prototype PCB's these wires are essential there are times that you need to reroute tracks on your PCB. It's also extremely handy to solder your veroboard proto with these.
At less than a rand a meter this is an absolute must for your toolbox.