Fantasy Flight Card Sleeves (FFS65): Blue Series (70 x 70 mm)
From the publisher:
Fits Cards of This Size: 2 11/16" x 2 11/16" (70 x 70 mm)
50 sleeves per package.
All sleeves in the Fantasy Flight Supply board game 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: Power Grid™, Catan Card Game™, The Rivals for Catan™, and many others