Silver Coins:
- Dime: 90% silver until 1964
- Quarter: 90% silver until 1964
- Half Dollar: 90% silver until 1964
Copper-Nickel Coins:
- Penny: 95% copper and 5% tin or zinc
- Nickel: 75% copper and 25% nickel
Other Metals:
- Cent (1943 only): Steel
It's worth noting that the exact composition and specific dates may vary slightly depending on the exact coin and year of issue.