This is a pack of "Dupont" style wires with Male to Male, Male to Female and Female to Female ends. Each wire is 20cm long (give or take).
Dupont connectors can fit into standard 2.54mm (0.1 inch, 100mil) PCB header pins and sockets, or of course can plug into each other. A standard cheap and easy method to connect wire to board or wire to wire for data and low current power.
Pack includes:
40 way Male to Male
40 way Male to Female (aka Female to Male)
40 way Female to Female
Of course these 40 way wires can be just split apart to reduce them as need be.
I have a variety of PCB headers available, see my other PCB Header listings here:
sparks.gogo.co.nz