MDG7041 Standard Card Game Size Sleeves (100) by Mayday Games These are designed for cards of 63.5mm x 88mm or 2.5in x 3 1/2\\\" . They are 100 per pack and priced for bulk purchasing (cheap). These sleeves are GREAT for card games with a lot of cards that stack. We have play tested a few thicknesses and this thickness works best if you have over about 75 cards in a pile. Any thicker and they simply fall over and difficult to shuffle due to the thickness.