These are designed for cards of 63.5 MM X 88 MM, or 2 1/2" x 3 1/2" . They are 100 per pack
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.