That's 400 coins per order. Normal circulated quarters as seen in the first few puctures. I have multiple available, as well as a separate listing for "loomis" branded rolls as seen in the following pictures.
You won't find silver, but could possibly find a W mint mark or other collector items. W is pretty rare I believe less than 1 coin in every 10,000 coins or somewhere in the ballpark of that. Post office delays also possible.