US Mint Silver quarters proof sets have quarters that are made of 90% silver, same as historic currency used before 1964. Each set has 5 silver quarters of proof quality. Quarters from these sets show US states on the reverse side, and you can try to collect all 50. All in OGP (original government packaging) and have COA (certificate of authenticity).
Priced for quick sale. Total about 3.62 ozt of silver. Priced individually below melt. $210 if you buy the whole lot.