These flexible breadboard wires have appeared on the market fairly recently and are really handy. They combine the nice features of both stranded and solid wire. Stranded wire is more flexible and is great where wires need to be flexed. It’s always way more work to connect stranded wire though, and usually requires tinning the end with solder to use on a solderless breadboard.
Solid wire is easy to connect, but tend to break when flexed.
The wires in this kit have solid ends soldered to a stranded length of wire. This means the middle is flexible, but the ends are stiff, so they are easier to connect to breadboards. The end connectors are reinforced with vinyl for ease of use. So you get the best of both worlds.
There are 75 wires in this kit 55 wires @ 4″ (100mm), 10 wires @ 6″ (150mm) and 10 wires @ 9″ (225mm).