Heart Flag Enamel Charms (12 Pack) 16mm X 17mm. Metal. These metal charms are perfect for crafting patriotic jewelry! Create an accessory to wear on the Fourth of July, Memorial Day, or year-round! Not looking to craft anything now? Add these enamel charms to your jewelry making supplies for an added touch of patriotic flair! 16mm x 17mm 1 Dozen.