Pure Copper: Back probe test leads are copper flexible wires. Wire Length: 3.3ft. Rated current: 5A. Banana Plug: 4mm. The stainless steel needle is only 0.07mm.
Back Probe Kit 20PCS Banana Plug to Copper Alligator Clip Test Leads Kit
Peakelect Back Probe Kit 30PCS Banana Plug to Copper Alligator Clip Automotive