The US Mint 2011-S Mint Proof Set is a collection of 14 uncirculated coins with a Certificate of Authenticity from the U.S. Mint. This set includes coins denominated in $1, Half Dollar, Quarter, Dime, Nickel, and Cent, all composed of copper, nickel, zinc, and manganese. Minted in San Francisco, these coins are in proof condition, making them ideal for collectors looking for pristine pieces from 2011.