The CWS Slip-EZ Coin Folders first came onto the market in 1970 and designed for the novice collector who had for years complained about coins falling out of old style cardboard holders. The half-moon slits allow coins to enter a pocket and helps hold the coin secure. The material used in the manufacture of this product has been successfully market tested for 25 years. These books are Titled and dated on front cover and contain two clear vinyl pages so the coins can be viewed from both sides. It may requirer more than one book for a complete set of coins depending on the tpye.