A single lucky penny keychain with engraving on it along the edge. Add your custom text to the penny. Great gift for your anniversary. Pennies are made of copper and will age naturally over time to an antique color. Made with a real penny, which measures about 3/4 inch across. Pennies are made of copper and will age naturally over time to an antique color. Please specify in the notes at checkout what penny year you'd like and what you'd like engraved along the edge.