2010 introduced two new design series - the Shield Cent and the National Parks State Quarters. The 2012 Silver Proof set contains 14 coins..they are as follows:
Lincoln Shield Cent
Jefferson Nickel
Roosevelt Dime
National Park Quarters- 5 different 2012 designs (El Yunque - Puerto Rico, Chaco - New Mexico, Acadia - Maine, Hawai'i Volcanoes - Hawaii, Denali - Alaska)
Kennedy Half Dollar
Sacagawea Dollar
4 Presidential Dollars (Chester A. Arthur, Grover Cleveland, Benjamin Harrison, & Grove Cleveland)
The Dime, the Quarter(s) and Half Dollar in this set were struck out of .900 fine Silver. The proof coins in this set were struck at the San Francisco Mint.
The term "Proof" refers to a method of manufacture and NOT the condition of a coin. Proof coins can usually be distinguished by their sharpness of detail, high wire edge, and extremely brilliant, mirror like surface.
Proof coins are made from highly polished dies. The coinage blanks are also polished and cleaned. They are hand fed into a coinage press one at a time, with each blank receiving 2 or more strikes from the dies to bring up sharp-high relief details. It is done at slow speeds with extra pressure. Finished Proofs are individually inspected and handled by gloves or tongs prior to being placed in sonically sealed plastic cases. All Proofs are originally sold by the US Mint at a premium.