Card sleeve, Yu-Gi-Oh! Wiki

Card sleeves (カードプロテクター kādo purotekutā "card protector") are protective plastic covers used to prevent cards from getting bent or scratched. Most card sleeves are made by third-party manufacturers, though Konami distributes a few styles of their own sleeves. If a player uses card sleeves, they must all be the same so their cards aren't marked. Also, if a player use a card sleeve on their Extra Deck, it must differ from the Main Deck. In case of Side Deck, the card must have the same backing as

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Card sleeve, Yu-Gi-Oh! Wiki

Card sleeve, Yu-Gi-Oh! Wiki