The set is made of Cupro-Nickel with a fineness of 0.9 and has a Proof strike type. It is US Minted with a Bulbous Serif S Mark, and it is Uncirculated. The set has not been graded but comes with a US Mint certification. This 1981 S Proof Set Type 2 is a valuable addition to any coin collection. It was minted in San Francisco and complies with all US Mint standards. It is a rare find for coin enthusiasts and a great investment opportunity. Each coin is in pristine condition, making this set a perfect gift for any collector.