Measuring approximately 3/4" in diameter, these reversible, sterling silver U.S. military medals feature St. Christopher on one side of the medal and a specific service branch; Air Force, Army, Marine Corps, Navy, or Coast Guard on the other side. Choose branch from selection box above. An 18" chain is included. Longer, continuous chains (no clasp) are available - choose from selection box above. See these designs also in our Gold Reversible Military/St. Christopher Medals #8123 .