Proof Gold coins are limited edition bullion coins which undergo a specialized minting process that begins by manually feeding burnished 22-karat coin blanks into presses fitted with special dies. Each coin is struck multiple times giving the appearance of a softly frosted image floating above a mirror-like background. Denominations include one ounce, half ounce, quarter ounce, and tenth ounce coins. The four-piece set includes one of each size, for a total of 1.85 ounces. There is also a two-piece set which includes a one ounce and a half ounce coin. The various denominations also come packaged individually.