This cube works with 24, 15-card, unsleeved packs. I am using it for my pauper cubes that I build. There is space for magnets in the base and top, you may want to adjust it from the raw file however. I am using a 5mm neodymium cube magnet in the base and a 5mm diameter circle magnet in the top. Its a tight fit and held by friction, which works well as the top slides on rails, and does not use a lifting motion