Build bigger, stronger and more spectacular objects and structures using Pro-L series of magnetised rods from the Swiss-made brand Geomag™. Each rod has a polarity indicator, as shown on all Pro-L rods, which allow professional builders to explore better, and understand more about the potential of magnetism, with the aid of these powerful magnets. Pro-L Pack includes 110 pieces consisting of 36 Po-L rods, 30 metal balls, 20 triangle-shaped panels, 18 square panels, and 6 octagonal panels.