This is a bundle of 20 jumper wires of varying length. You get 5 wires at each of four different lengths: 5 inches, 7 inches, 9 inches, and 12 inches.
Each wire has a female crimp-on connector on one end and a male pin on the other.
These jumpers are perfect for using prototype PCBs in conjunction with solderless breadboards.
The wires can be daisy-chained to make longer lengths.