Ceramic precision balls are available in diameters from 0.2 mm. The maximum available dimensions for silicon nitride, aluminum oxide and zirconium oxide are 100 mm. For sapphire and ruby, the available maximum size is 35 mm and 12.7 mm respectively.
As with precision balls made of other high-quality materials, ceramic precision balls are available in various qualities. The following table gives an overview of the qualities (according to AFBMA 1975 and ISO 3290).
Standard tolerance diameter ±0.25 microns, spherical ±0.25 microns and with a very smooth surface.