The pack contains 44 balls 37 metallic blue rods one indicator rod one square plate two tubes 22 washers 16 feet per washer 16 linear bars three squares per bearing two cages per bearing one plate and one coneGeomag is the most famous magnetic construction game in the world which consists of magnetised rods and metal ballsThe rods are connected to the balls by the magnets attached to both ends so you can build everything you can imagineGeomag products are qualified in the STEM abbreviation for science technology engineering and mathematics category indicating an interdisciplinary approach to learningSwiss quality guarantee all products are oriented to the strictest European and international safety standards