Solid Core Wire

Velleman solid core prototyping wire in 10 colors from Amazon January 2014.

Solid Core Hookup Wire for bread board prototyping electronics projects
 

The variety of colors is useful for prototyping breadboard circuits.

Solid Core Wire for Bread Board Prototyping
 

I use my favorite thread snips to strip the jacketing off the wire.
Solid COre Wire for Bread Board Prototyping