Be careful! Many dealers sell 90% "junk" silver bags, not based on actual weight, but on face value of the coins. What isn't taken into account is the fact that most of these coins have some wear on them, and they rarely weigh 100% of what they weigh when they come from the mint. This weight difference can often cost you from 2% to 5% of the value of what you think you're buying. The only way you can know what you're getting is by buying based on the actual weight of the coins you're buying. Take 90% of the total weight in grams and divide by that sum by 31.1, & that will tell you how many troy ounces of pure silver you're actually getting. Multiply that number of ounces by the current spot price, to determine the true spot value of what you're buying. Caveat emptor! fs