Glass Tile Magnets These use anisotropic magnets, with a strong magnetic sheet. One tile could hold three sheets of A4 copy paper to a refrigerator (and didn't fall off even when the door was opened and closed). With four sheets, it slides down. * Depends on the paper thickness. There are 31 tiles in total, so they could be used for a calendar to-do list (e.g., to stick on completed tasks).