The Japanese magnetic set Magnet Block is known as Magneto Block in Europe. It comes in a case with a lid that serves as a building plate. 2 hemispheres with magnets are already mounted in the lid, and there are sokets for installing both balls and rods.
![Magneto Block Magnetic Building Kit Magneto Block Magnetic Building Kit](https://buildkitpedia.com/wp-content/uploads/2023/07/magneto3.jpg)