Very thin Dragon Shield clear sleeves with lateral insertion. They're the exact same size as a card, allowing to double-sleeve your cards.
Dragon Shield - 100 Sleeves - Perfect Fit size - Top Loading
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Dragon Shield 100CT Side Loading Clear/Smoke Perfect Fit Card
Dragon Shield Sleeves Perfect Fit Sealable Clear (100 pieces
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100 Clear Classic Soft Standard Size Sleeves - Ultimate Guard
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Dragon Shield Sleeves Perfect Fit Sealable Clear (100 pieces