Card sleeve - Yugipedia - Yu-Gi-Oh! wiki

Card sleeves (Japanese: カードプロテクター kādopurotekutā "card protector"; Korean: 카드 실드 kadeu sildeu "card shield"; also known as Duelist Card Protectors) are protective plastic covers used to prevent cards from getting bent or scratched.[1] Most card sleeves are made by third-party manufacturers, though Konami distributes a few styles of their own sleeves.[2][3][4][5]

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