PinMart USAF Air Force Challenge Coin Die Struck, this coin is gold plated on one side, nickel plated on the other and hand filled with enamel colors. The sandblasted background and high polished surface makes it a truly beautiful piece. Each coin is packaged in aprotective vinyl pouch. SIZE: 1-5/8" diameter Remember and commemorate the men and women past and present of the United States AirForcewith this greatcoin.