Build a run, test it, then make it better! Little engineers-in-training will love creating imaginative ball runs with Connetix magnetic tiles and tubes. Connector squares hold clear tubes in place while wooden balls race through bends and spirals—and this 80-piece expansion pack is perfect for building new and imaginative creations. Connetix magnetic tiles encourage hands-on learning through open-ended, STEAM-based play. Each tile has magnets ultrasonically sealed inside, allowing kids to snap them together as they build 2D and 3D creations.