What is the valve 1919 wheat penny nonmetallic?

The term "valve 1919 wheat penny nonmetallic" seems to be a miscommunication or confusion, as a 1919 wheat penny is a U.S. coin made primarily of copper. Wheat pennies, minted from 1909 to 1958, feature the image of wheat stalks on the reverse side. If "nonmetallic" refers to a specific type of alteration or a novelty item, it would not be a standard representation of the original coin. For clarity, it would be helpful to explore the context or specific characteristics being referenced.