Although I called it Tower Bridge it is not a reproduction of the famous London bridge. Made of rod magnets and steel balls this is the structure in which I have used several geomag style magnets to date. 1726 x Rod magnet 5x25mm: https://sumag.net/s-05-25-n-x02 6 x Rod Magnet 5x13mm : https://sumag.net/s-05-13-n-x01 370 x Steel Balls […]