These are sized to fit cards Card Game Card Sleeves (57.5×89 mm). This is a common sleeved used in lots of games; A list of games that use this sleeve can be found on Sleeve King’s website.

Thicker, Stronger; Most “Standard” Sleeves are 40 microns thick, these are 60-microns thick!
10% More Sleeves: 110 sleeves for the price of 100.