I ordered a second set of jumpers because everything I've read about them says they are copper clad aluminum wires, but before the other set arrived I cut off the end of one of them, just to check and i was surprised that the soldering works fine. This might have been the same male-male combination to choose from, but I'm taking a chance and assuming they were all made from the same mass-produced material. However, they were cheap and did what I needed. I am very happy with my purchase.
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