Banana plug test leads are made of copper material which are soft, flexible and nice to work with. Sturdy Banana Plugs and insulation greatly enhance durability and flexibility of the leads. Every electronic should have these cables. Test leads kit comes with 10PCS tiny but powerful permanent magnet connectors, so quick and strong connections can be made. 4mm can be connected to a banana plug. Troubleshooting is now a breeze, no more alligator clips constantly popping out of terminals or shorting meters by hand. Specifically designed for embedded terminals in thermostats, control panels, sensors, switches, and alarm boards. Protective caps: Max 4mm cables can be fixed in the cover groove without slipping and stabbing when testing. Two kinds of usage: Testing cables through protective cover. Testing or -type components without protective cover. Colour:As Shown Material:copper Package Contents: 5 x banana to banana plug test leads 10 x magnetic connectors Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.