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.<br> 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.<br> 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.<br> 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.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store