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Stick on weights are 99.5% pure. Clip ons are a good bit harder, around 12 BHN. You have to go to tire shops and talk to the repair guys. They'll come closer to giving you a bucket or two than the managers will. There will be a percentage of zinc weights but keep your heat down and they will float on top.
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That' hasn't been true for more than 20 years.
Wheel weight alloys are all over the map. You never know what you're going to get, no matter what type of weight it is.
You can see batches of clip-ons at BHN 7, batches of stick-ons at BHN 15, and anything in between.
Wheel weights are no longer made with properly mixed alloys. They are made with whatever
contaminated scrap alloy is available at the foundry, even if it's contaminated with aluminum, zinc, cadmium, strontium, or anything else. Wheel weights don't have to be made with a good alloy, so they aren't.
All of the claims of specific alloys and hardnesses applying to different types of wheel weights haven't been true since the '80s and/or '90s (depending on the type of weight). Don't assume anything...
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Lead is incredibly poisonous. it's in the groundwater here, it's in the topsoil and grass, it blows in the wind, it's in the pavement even.
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Some forms of lead are hazardous.
Most forms of lead should be considered completely inert and harmless.
Being afraid does you no good, unless you know what
type of lead you're dealing with.