The vintage brass bookmark measures 3 ½” in length. The bookmarks are sourced from an American supplier. The Jacksonville map comes from an air navigation sectional chart, which is used by pilots, and measures 20mm. You do not have to be an aviation enthusiast or a pilot to use these travel bookmarks. But it helps. If you are looking for a gift for your favorite bookworm, here it is! The Jacksonville travel bookmark is a recommended unique gift for pilots or a travel gift.