Other jumpers I've bought have had marginal connectors, bad cables, or both. Those jumpers seem pretty good. The connectors are of the correct crimp type and the number of strands, material and gauge of wire are as advertised. For a quick test, I ran an absurd current (10 amps) through one of the 30cm MM jumpers and the voltage applied was only 0.32 volts. I am very happy with this purchase.
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