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+1 on what Snuffy said. However, you can also drop the weights on a concrete floor and the Zn and Fe ones will have a definitely different sound to them compared to the thud of lead weights. Any that are riveted will be Fe and they are easy to tell the difference on.
The stick-on type weights come in the different metal types as well. Most of them (the undesireable ones) are marked Zn or Fe or are of a very dense foam-like material. The lead stick-on weights are generally considered soft enough to use straight for muzzleloaders. A lot of casters will mix the stick-ons with clip-ons at 50/50 for use in handguns or light rifle loads.
I have not run into any bismuth yet but have heard about them. My guess is that they would be quite a bit more expensive to make than straight Fe or Zn.
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