Here are the magnets used: Zoprima Magnets - Neodymium N52 Powerful Rare Earth Magnets - Round Flat Super Strong Magnetic Discs - Craft, Fridge, Office, Science, DIY Magnets (Dia1.26x0.06", 12-Pack with Spacers): Amazon.com: Industrial & Scientific
The author remixed this model.
I've added magnet slots on the back for 1.5mm magnets.