This 2006 S US Mint Clad Quarter Proof Set includes 5 coins with a denomination of 25C. The coins are uncirculated and made of clad copper. They were struck with proof quality at the San Francisco Mint location and are ungraded. The set features 5 of the 50-state quarters and was manufactured by the U.S. Mint. This item is not modified and does come with it's certification. Please check all the photos as they are part of the description. You can see the box was opened and a corner is sticking out a little. Thanks for looking