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They aren't anymore. "Shell-case" cents were only made in 1944 and 1945 when the government had to dispose of huge numbers of casings that had been used for ammunition in WW2. The shell casings were melted down and alloyed into bronze for use in pennies.

Starting in 1946 normal mined copper, tin, and zinc were used. In mid-1982 the composition was changed to 97.5% zinc and 2.5% copper because copper had become too expensive.

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14y ago
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Q: Why are pennies made with copper shells?
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