BCW Inner Sleeves are an acid-free, archival quality product that is designed to protect your valuable cards. These sleeves fit perfectly inside a regular card sleeve doubling the protection on your card and making the combination virtually waterproof. The price of a pack of inner sleeves in negligible against the price of replacing expensive cards. 100 sleeves per pack. Size: 64mm x 89mm. Fits inside standard sleeve. Protect cards while shuffling and playing.