The nuts and bolts are easy grip, characterized by bright colors and fun. So the screws and turning the course will not! The red balls, the yellow cones and blue cylinder eventually need but also explore all the hiding places of the apartment. ;) The green cubes are rather what for pushing or shoving. Build turrets works, moreover, well, even better the blow. Generally they are very good in the child's hand our son (1.5 years). The forms are interconnected flexibly interchangeable. The learning effect, turning even discontinued and new to put the finger uses quite quickly, so the fun even outweighs new color combinations of 2 or 3 parts of creating and proud to present the mom or the dad. We bought two packs thereof, as they are only enfach great and a bit more selection is also quite nice, especially with s several children. The sturdy cardboard is used incidentally as storage also from our son, of course, also for transport to the place xy (playground, excursions ...). Small, light, fun - everything available, what you need and is simply practical.