Environmental Consequences
Every year, millions of small weights are attached to tires by automotive technicians while balancing them. According to the US Environmental Protection Agency, worldwide these total more than 20,000 tonnes of lead annually. Traditionally, these weights have been made of lead, but since lead is a toxic metal, political authorities and industrial groups are in the process of converting to materials that are less toxic than lead. The tire weight shown in the illustration has a "Zn" stamp, indicating it is made of zinc rather than lead.
Read more about this topic: Tire Balance
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