This is one of the most popular card sizes for euro board games, the Mini Euro Size. This size of 6.8 CM by 4.5 CM is the "standard" among most euro games that use smaller cards.

Any game that has a card width of 4.1 CM to 4.5 CM would fit well into these sleeves as long as the height is 6.8 CM or shorter. You can always trim a bit off the top if you need to.

For a list of games this is compatible with you can check this geeklist in BGG: Games with "Mini Euro" Card Size of "roughly" 68 MM X 45 MM

These 45 MM X 68 MM sized sleeves are 100 per pack and retail for $1.75 each.

The games this is compatible with include Saint Petersburg, Hoity Toity, Amun-Re, Attika, Doge, El Grande, Giganten, GOA, Maya, Medici (older version), Ticket To Ride (yes the original Ticket To Ride!), Traders of Genoa, TransAmerica, Aton, Drunter und Druber, Euphrates and Tigris Card Game, Il Principe, Thurn & Taxis, Age of Discovery, Palazzo, Pillars of the Earth, Razzia!, Scepter of Zavandor, Shogun, Walhalla, Wings of War, Ys, Yspahan, Masons, Louis XIV, Chinatown, Battlestar Galactica, Arkadia, Hacienda, Weinhandler, Arkham Horror, Dungeon Twister, Through The Ages, Emerald, Twilight Imperium, World of Warcraft: The Boardgame, Prophecy, Cuba, In the Year of the Dragon, San Marco, Stephenson's Rocket, Around the World in 80 Days, La Citta, Tower of Babel, Alexandros, Submarine, Industrial Waste, Leonardo da Vinci, and we are sure several others we just don't know about yet! Yes there are a lot of games these work for!

100 Sleeves per pack! These are "standard" thickness and we will probably never make a thicker sleeve for this size as these cards are so small they wouldn't stack very well in thicker sleeves.