Card sleeves are thin, transparent plastic sheets that are used to protect trading cards and other collectibles. They are typically made from a durable, acid-free plastic material that is resistant to damage and wear. Card sleeves are used by collectors to protect valuable cards from damage such as scuffing, bending, and fading, which can reduce their value. They are also often used to protect cards from moisture, dirt, and other environmental factors. Card sleeves are available in a variety of sizes to fit different types of cards, and they can be used to hold a single card or a group of cards. They are commonly used in conjunction with other types of card storage products such as card binders and card boxes.