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Here are some common game card sleeve sizes:
 

Standard Size: The most common game card holder size is standard size, which is suitable for most regular card games, such as poker and most trading card games (TCG) or card games (CCG). Standard size game card holders are usually 63.5 mm x 88 mm (2.5 inches x 3.5 inches).

Small Size: Some card games may use smaller cards and require card sleeves of corresponding sizes. For example, some Japanese trading card games (such as "Yu-Gi-Oh") often use small-sized cards, and the corresponding card sleeve dimensions are approximately 62 mm x 89 mm.

Large Size: Some games may use larger size cards and require specially designed card sleeves to protect these large size cards. The size of large card sleeves will vary from game to game, such as special skill cards in some role-playing games (RPGs) or large game cards in board games.