216pcs 5mm Buckyballs Magnet Balls Puzzles Magnetic Balls - Red 
216pcs 5mm Buckyballs Magnet Balls Magnetic Toys - Color Change 
216pcs Blue Neoballs 5mm Magnetic Balls Buckyballs - Blue Magnetic cube – it consists of 216 highly magnetic rare earth magnets (a single magnetic ball is 5 mm in diameter) and each magnet has a north-south polarity.
2.5mm
7mm Nickel Buckyballs
Simply using a magnetic cube can improve your intuitive sense of geometry and math. You can use the magnetic ball rubik's cube as the education tool to learn from the textbook, so that you can better understand the geometric knowledge through both theory and practice. Since geometry requires a strong spatial visualization ability, it can be used as a teaching tool to effectively improve the performance of the geometry section.