2001 Penny Keychain With Heart Around Year; Engraved Couples Keychain, 18 year Anniversary Perfect for couples 18 year anniversary gift (18 years gift, 18th year gift), or for a best friend gift The US one cent coin is called a penny and is a symbol of luck. Packaged on a card with saying "What a Lucky Year!" The copper coin is a USA one cent penny 20 mm diameter. Handmade item, engraved, made in USA, net weight: about 5g.