What are the diameters of the Spheremaker ceiling caps?

The diameter of the ceiling cap of the Spheremaker 1 is 10 cm
The diameter of the ceiling cap of the Spheremaker 3 is 30 cm
The diameter of the ceiling cap of the Spheremaker 6 is 60 cm
The diameter of the ceiling cap of the Spheremaker 9 is 90 cm