Lead for jig heads ?

[Laroo]

I know that everyone says not to use wheel weights as a source for casting lead, I assume that everyone is talking about the kind that clamps onto the rim of a steel wheel. What about the small square weights with the adhesive back that sticks onto aluminum wheels, is it the same, it seems to be quite soft. Has anyone tried these kind of weights,is it just the same old wheel weight lead?
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