20 pcs set of female / female jumperwires. These are 15cm long jumpers with female connectors on both ends. Use these to jumper from any male header on any board, to any other male header. Combine these with male to male jumpers to create a male to female jumper. Multiple jumpers can be installed next to one another on a 0.1" header. Comes as 1 package of twenty jumpers in five colours. 4 of each colours: black, green, blue, white, red.