Double Keychain Set 2015 Penny Keychains With Heart Around Year; 4 year Anniversary Gift, Engraved Couples Keychain Perfect for couples 4 year anniversary gift (4 years gift, 4th 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 the 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.