DIY magnets
https://www.amazon.com/Gorilla-Force-Magnets-Scientific-Industrial/dp/B06XS8R1QY Gorilla Force Neodymium Disc Magnets Pack of 12, Very Powerful, Strong, Permanent -1.26" x .08" Rare Earth Magnets, Great for DIY, Crafts, Office Magnets Best Value Industrial Grade: Amazon.com: Industrial & Scientific