|Coin||Composition||Weight||Cost to Produce|
|Cent||2.5% Copper, 97.5% Zinc||2.5 g||2.41 cents|
|Nickel||25% Nickel, 75% Copper||5 g||11.18 cents|
|Dime||8.33% Nickel, 91.67% Copper||2.268 g||5.65 cents|
|Quarter||8.33% Nickel, 91.67% Copper||5.67 g||11.14 cents|
|Half Dollar||8.33% Nickel, 91.67% Copper||11.34 g||N/A|
|Susan B Anthony Dollar||12.5% Nickel, 87.5% Copper||8.1 g||N/A|
|$1 Coin||88.5% Copper, 6% Zinc, 3.5% Manganese, 2% Nickel||8.1 g||18.03 cents|
The 2008 US Cent is composed of a 99.2% zinc and .8% copper core with a plating of pure copper.
The 1983 and later dated pennies are comprised of a zinc core covered
The US Mint maintains a chart of the specifications for coins on their website (see reference). Found with a simple web search. Source(s): http://www.usmint.gov/about_the_mint/ind
The penny remained 95% copper & 5% zinc until '82, & was then changed to 97.5% zinc and 2.5% copper!