This is the full Pokemon Unown alphabet made into magnets.
They're roughly 30-35mm tall. The one piece models can easily be printed with two colors. The black base is 3mm tall and the white section is 1mm tall making them 4mm tall overall. Simply use a "pause at height" command in your slicer to change filament.
There is also a two piece version of each symbol so that you can print them face down on the bed for a nice finish and then glue the eyepiece into the body.
The backside has a 10.4mm wide by 2mm deep recess to accept magnets. Use glue to install them. These magnets fit perfectly: https://www.amazon.com/FINDMAG-100Pieces-Magnetic-Whiteboard-Refrigerator/dp/B07CNBSMDZ/ref=sr_1_4?crid=2ZZU6387BYJ1&keywords=2x10%2Bneodymium%2Bmagnet&qid=1642258164&sprefix=2x10%2Bneodymium%2Bmagnet%2Caps%2C60&sr=8-4&th=1
The author marked this model as their own original creation.