Sumnacon 5 Pcs Dual Ended Crocodile Alligator Clips, 15A Test Lead Wire Cable with Insulators Clips, 5 Colors 3.3 ft/1m Test Flexible Cable with Protective Jack Copper Clamps for Electrical Testing

Works well and I believe that they will last for a long time. I would recommend these.

Buena calidad en materiales y acabado, muy útiles para conexiones eléctricas temporales.

Electficlly circuits.

Though expensive, these crocodile clips are good value compared to the cheaper rubbish. They are more suited for heavier duty work, electrical rather than lightweight electronics. The clips are sturdy, approx. 4mm on the nose, covered in a one-piece moulded flexible plastic that also serves as a cable strain relief. The wires are similarly well protected, and the insulation material slippery enough to make separating a tangle of 5 wires easy. I measured the short-circuit voltage drop @5.1A at 94-96mV (4-wire measurement), which is about 18mOhms, which would make the conductor about 16AWG stranded copper; 15A would be 'suboptimal' but it happens and it shouldn't fuse ;-)

These are high quality cables. Their resistance reads 0 Ohm. They're useful for all kinds of electronic projects and will not cause a voltage drop.