Test leads are made of high quality silicone material. Silicone can help with longevity and easy of use. Silicone leads are soft and resistant to high and low temperature.-Banana plugs are stackable. You can plug more than one banana plug into the same banana socket. So you can quickly use another style lead without having to plug or re-plug in leads.-The other end of the test wires is Male jumpers for breadboard projects, which is pure copper insulated for smooth conductivity. Suitable for connecting a wire to breadboard from power supplies, LED strips, multi-meters and Lilypad.-Suitable for electrical and electronic testing. They're also suitable for Arduino, Raspberry Pi, Orange Pi, wearable circuit projects or a breadboard experiment.-Package include: 10PCS Stackable Banana Plug to Breadboard Male Jumper Wires 5 colors. Length: about 27.2cm. 5 colors help you distinguish them well when doing testing.