Looking to shell out some serious coin during the next promotional campaign? These 1.5" zinc Challenge coins are popular collectibles that will make a lasting impression! They rival in quality to our brass coins at a lighter weight. Originating during World War I, Challenge coins were issued to battalions as symbols of camaraderie and unity, and later they were used as a way of verifying membership in clubs, groups and military units. They are now commonly given away at military and DOD meetings as a token of appreciation. Customize this memorable keepsake with an imprint of your choosing.