Pure Copper: Back probe test leads are copper flexible wires. Alligator clips are made of copper alloy material. Wire Length: 3.3ft. Rated current: 5A. Banana Plug: 4mm. Back Probe: Five colors back probes are made of stainless steel and can be easily measured at three different angles. The stainless steel needle is only 0.07mm. It can be easily penetrated to measure when it is non-destructive. Three different probe angles can meet your various testing needs. Function: Back probe kit can be used not only for automotive diagnostics, testing and repairing, but also in physics laboratories, schools, homes and industries. Probes can easily insert into automotive connectors and use on harness connectors, fuel injectors and automotive sensors. Package include: 5PCS banana plug to alligator clip copper test leads, 15PCS back probes(5 colors), 2PCS alligator clips, 2PCS Extended Length Probes, 1PC portable storage box. Hope you can be satisfied with our products. We will always provide friendly customer service. Goupchn Back Probe Test Leads Kit provides you with high quality products which are safe and easy for all professionals, auto or diesel mechanic and DIY people. It is a multifunction kit to do testing including banana plug to alligator clip copper test leads and 3 configurations test probes. Suitable for car repairing, automotive diagnostics, testing.Back probes kit has been designed to be easier and comfortable to use. Leads are made of pure copper material which are soft and flexible. Test probes are precision and sharp for using in tight space. The surface of the products are coated with PVC insulation layer, please rest assured to use them.