| Free shipping on orders over $199 |  |
Order early for pre-holiday delivery. Flinn (or Educational Innovations) will be closed December 24th, 2025,
through January 4th, 2026, reopening Monday, January 5th, 2026.
Orders received after 10:30 AM Central Time on Tuesday, December 23rd, 2025, will ship after we return.
DC10238
Price: FREE
Pennies are made of copper, aren’t they? The outside is certainly made of copper, but that’s not the whole story. Before 1982, pennies contained about 95% copper and 5% zinc. After 1982, however, the composition of pennies was changed to contain mostly zinc and only a small amount of copper. In this activity, the percentage of copper and zinc in post-1982 pennies will be determined.
1-800-452-1261
