Investing in Copper is a great diversification to precious metals as a bulk tangible asset investment. Copper U.S. pennies, as coins to collect in bulk, are a unique way to invest in copper and allow for way to monetize copper price and brass while having a floor investment value based on currency.
There are very few investments with such a low risk. Your copper penny may have a copper value, but it also will be worth a penny. This means your copper penny holds three values: Copper investment value, trade value, and a currency value as money.