2014 United States Silver Proof Set - 14 pc set. This set contains 14 coins in proof quality, protectively encased in three clear plastic lenses and newly designed packaging. The 2014-dated quarters, half-dollar, and dime are struck in 90 percent silver, generally referred to as “coin silver.” The silver in these coins can be seen by viewing the edge of the coin in the lens. United States Mint proof coins feature sharp relief and a mirror-like background. The coins are then packaged in a protective lens to showcase and maintain their exceptional finish.