Unlike Proof sets, the coins contained in uncirculated sets are not minted with any special quality considerations. They are the normal coins intended for circulation. Coins that are struck as Proof only issue are not included. Beginning in 2005 the US Mint started minting Uncirculated Mint Sets with a satin finish for the look and to provide consistency. It also helps collectors differentiate between Uncirculated Coins and US Mint Uncirculated Coin Sets.