This is a bundle of 65 jumper wires for quick and easy prototyping on a breadboard. If there aren’t many connections these wires more convenient than pre-formed rigid jumpers, when you have wires running every which way, the longer wires can cause confusion. If your project does have a lot of wiring, it is a good idea to combine the rigid and flexible jumpers.
We suggest having both kinds of connectors and use the most suitable one each time, so why not buy both? ;)