Why should you invest in these wires? Simple the sleeve is heat retardant; have you ever soldered thin wire and the insulator around the conductor just melts away and causes shorts, with this wire you won't have that problem. Do your self a favor and get some of these.
8 Colours: Black, Brown, Red, Orange, Yellow, Green, Blue and Violet (25 meter of each)
Outer Diameter: 0.55mm
Inner Diameter: 0.23mm