These are for cards that are 2 5/16 X 3 9/16 inches in size (59 MM X 92 MM). Worried about fitting your cards back in the box? With our Premium Thickness Sleeves you get better protection but with 500 cards in Dominion you do have a bit more work to fit them. All you have to do is put the Gold in the Silver Slot, the Silver in the Copper Slot and the Copper in the large unused middle slot, plus a couple of curse cards behind the Trash card. It isn't ideal but it works well and everything else fits pretty well!