Pre-1982 pennies are made of bronze, which is 95% copper plus 5% tin and/or zinc.
Post-1982 pennies are zinc with a thin coating of copper.
Copper
US cents minted since late 1982 are composed of a core of 99.2% zinc and 0.8% copper with a plating of pure copper.
Those are 95 percent copper. A US penny weighs 3.11 grams. Of that, 2.9545 grams is copper.
copper
The last year for copper US pennies was 1982.
A US copper penny is exactly 2 cm wide.
In 1961 pennies were made of 95% copper and 5% zinc.
A 1983 Lincoln cent is actually copper plated zinc, 1982 was the last year for copper pennies. It's just a penny.
2 cents.
A 1994 US cent is zinc not copper, spend it.
In 1943 the US Mint briefly replaced the copper penny then in use with a steel penny, due to the wartime copper shortage.
The price of the copper used to make a penny cost more than a penny.