These sleeves are perfect for the game Space Base and any other cards that are 40 X 89 MM in size. Note that we sized these for 40 X 89 cards rather than 39 X 89 so we could also accommodate Coin & Crown, another popular game that is just 1 MM wider than Space Base cards, but both of these games' cards will be well protected in these sleeves! ** Note Game Titles and their intellectual property rights are and TM of their respective rights holders, no challenge to these rights is expressed or implied. Compatibility claims only extend to the physical size of the cards in each respective game and no claim to endorsement or authorization by the respective rights holders is expressed or implied by Sleeve Kings. Our products are compatible with the respective games only and all rights are reserved by the respective rights holders.