Dansco Slipcases or Slipcovers are used to limit air movement around your coins. Your Dansco albums slide into these so that the binder's spine is still exposed so you can read the album's gold leaf title and album number. The Dansco Archival Quality Slipcases are produced with Silver-Guard Corrosion-Inhibiting protection. No other product on the market matches Silver-Guard Corrosion-Inhabiting protection. This Military Specification material permanently neutralizes corrosive gases in the air that can cause toning and discoloration. This works with silver, gold copper, and nickel coins and metals, medallions, bars, and ferrous metals. Dansco Coin Albums have always been made with the best archival materials and with the addition of the finely crafted slipcase the protection is invaluable.