This is a pack of 40 x Jumper Wires Male to Male. These wires are great for prototyping with breadboard, Arduino, Raspberry Pi, sensors and other modules. Great for making test connections. They come in different colors for easy color coding. A highly useful connecting wire. It comes with male connectors at both ends, can be used to make quick connections between Arduino, Raspberry Pi, Sensors, Motor Drivers, other modules, headerpins, FRC pins, berg pins, etc. Excellent for rapid prototyping.