Adafruit Hook-up Wire Spool Set - 22AWG Solid Core - 6 x 25 ft
Perfect for bread-boarding, free wiring, etc. This box contains 6 spools of solid-core wire. The wire is easy to solder to and when bent it keeps its shape pretty well. It is useful to have a few spools of this stuff around which is why this set is quite nice! Wire gauge is 22 AWG which we've found is the best all-around gauge, it works best with breadboards and perfboards but also fits in terminal blocks nicely
This box has a dowel rod to hold the spools in place and let them spin, and there are little punch-outs you can pass the wire through so it'll stay nice organised.