15 Reasons Why You Shouldn't Ignore refrigerator letter magnets
https://periodicos.ufpel.edu.br/ojs2/index.php/dissertatio/user/viewPublicProfile/204054
got these for my baby boy he's loving them especialy in the bath. these will definately help learning letters and numbers and colors. i've had some in the past where the magnet falls off the back not these.