The ingredients are always the same when building the homopolar motors: neodymium magnets, aluminum foil, copper wires and batteries. This time even some ferromagnetic coins. They are all very simple to do, so try it 🙂 These are the magnets used: https://www.supermagnete.com/S-20-10-N https://www.supermagnete.com/S-45-30-N