Standard 32 Marble Run Set by CuboroStandard 32 Marble Run Set by Cuboro. This medium sized starter set features all the basic elements of the world of Cuboro. Use rails and cubes to create original structures and your first exciting marble runs. With further Cuboro sets you can combine the starter elements step by step into larger track systems. This set contains 32 building pieces and five marbles. Recommended for ages 5 and up. Small marbles can be a choking hazard. Not suitable for