Mayday 54 x 80 mm 135 cards That would be the Yucata size Mayday? Did you sleeve with the regular thickness sleeves, or with the premium sleeves? I would like to sleeve using premium sleeve thickness, but I don't have experience with that size. (I've had no problems with premium USA, mini euro, and Card Size. However, the Euro and Chimera premium sleeves have been to tight/narrow and I've had to use regular thickness for those sizes.) I also saw that Mayday has a size that's very similar (Race Formula 90 size 55x80 mm).