Natural aluminum coin, 15 gauge 39 mm. Aluminum coins are the perfect way to add big excitement to your next promotion. Solid metal coins, convey greater value than plastic and wooden coins or tokens. In addition, aluminum's light weight is ideal for mass mailing or parade throws. We were the first to strike aluminum coins in 1892 and are still the largest producer of aluminum coins and Mardi Gras doubloons. Silver dollar size.