Project needs notched powerful ring magnets, you can take a look at this one, made of rare earth neodymium with galvanized surface, it's not a standard ring magnet but notched disconnected, like the letter C. If you need to customize it, please feel free to send us an inquiry and provide us with drawings.
Customized notched (open) ring strong magnets
Magnet knowledge science;
How Are Special Shaped Neodymium Magnets Made?