The 2011 S Proof Parks Quarter Set ATB 90% Silver features five coins from the America the Beautiful series, minted in San Francisco. Each coin has a denomination of 25 cents and is uncirculated, with a silver composition of 90%. This set includes coins from various national parks, making it a desirable addition to any coin collection. While it does not come with a box or certificate of authenticity, these coins are guaranteed to be of high quality and come directly from the United States Mint.