They appear to be of good quality material, I had copper wires. I've noticed a few reviews saying this isn't the case, but I have copper wires. The sensor was nice and thick, I didn't measure it, but it was more than enough. Lots of room to work. I also used some self soldering heat shrink tubing which made the job a lot quicker. I can highly recommend them for these purposes. Time will tell how they hold up but I think it will be a good decision for years to come.
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