The Economy Jumper Wiring Kit has 140 pieces of pre-bent wire for prototyping on solderless breadboards.
Yes, the flexible wires with the hard pin tips are cool, but messy. If you're trying to build something on a breadboard that doesn't look like multicolored-spaghetti stuck into a piece of mozzarella cheese, you need this sort of breadboard wire.
It's 140 lot variety pack of solid-core wire especially formed for logical, non-messy, breadboarding. Complete with organized plastic box. Of course.