This is a set of 40 jumper wires in a cable ribbon with a male connector or pin at each end. It is used to interconnect the components of a breadboard or other prototype or test circuit, internally or with other equipment or components, without soldering.
This type of cable ribbon is also know as DuPont cable.
Each ribbon can be easily broken down into smaller groups or even individual jumper wires by just pulling on the wires.
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