All sleeves in the Fantasy Flight Supply sleeve line are made of clear 100 micron-thick non-PVC acid-free polypropylene plastic. This means that the sleeves are durable difficult to tear or crease and are free of chemicals that will corrode the cards within the sleeves. The sleeves are also designed to fit cards snugly to make shuffling and handling easy. Examples of games with cards that this sleeve will fit: Arkham Horror Twilight Imperium World of Warcraft: The Board Game Red November Cave Troll. For Fantasy Flight’s sleeving guide (.pdf) click here (opens in a new tab).