Yep. 0.9042 troy ounces of silver. They are minted in "coin silver", or 90%, so you can just use any of the many "melt value" calculators running around, and treat them as Pre-65 washington quarters, for purposes of determining silver content or melt value. http://www.silvercoinstoday.com/silver-calculators/us-silver-coin-calculator/ happens to be my favorite. There are others.
Get all the quarters you want here http://www.apmex.com/Product/37167/10_FV_Roll_of_90_Silver_Coin_Impaired_Proofs___Quarters.aspx