Matt, possibly you've been reading stuff such as this minor-league scam. The truth is that any kind of material which is even a reasonably good electrical conductor is "well suited" for those straps. Even pieces of wire coathanger would be fine for the distance of 2" or so involved, since the higher resistance of steel as compared to copper would be insignificant over such a short distance. The supplied straps are probably brass, but whatever they are no "quality" question exists.

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Enjoy the music, not the equipment.