6" female to female jumper wires , sold as a package of 50 pieces (5 of each color)
These female connectors fit nicely with the headers on Arduino and Arduino compatible boards or any standard 0.025" square pin headers.

For use with Arduino experimenter kits

Features:
22 AWG, 6" long
Compatible with 0.025" (0.635mm) pin
Colours: Black, Blue, Grey, Red, White