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Game card sleeves often come in different sizes depending on the type of game cards. Different game cards may have different sizes and shapes, so the size of the game card sleeve will vary accordingly. Here are some examples of common game card sleeve sizes:

Standard Size: This is the most common game card sleeve size and is suitable for many trading card games (such as Magic: Gathering, Hearthstone) and life-style games (such as UNO). The usual standard size is 63.5mm x 88mm (2.5 inches x 3.5 inches).
Small Size: Some games use smaller size cards, such as many card games in Japan, such as the Pokémon Card Game. Small size ferrules are typically 60mm x 87mm.
Large Size: Some games may have larger size cards, such as character cards in tabletop role-playing games such as Dungeons and Dragons. Large size ferrules may vary in size but are typically 70mm x
120mm.