This 2006 S US Mint 10 Coin Proof Set is a must-have for any serious collector. The set includes all 50 State Quarters, each with a unique design and certification number. The coins are uncirculated and made of 0.15oz of precious metal content, with a strike type of proof. The set comes in its original box and is ungraded, making it a rare find for those looking to add to their collection. The certification is from the U.S. Mint, ensuring the authenticity of the coins. This set was minted in San Francisco and is a great representation of American history and coinage.