General description Set of 8 ball bearings suitable for the wheels of the Polaris 280 or 180 robot, corresponding to the reference C60 C-60. These bearings feature a plastic body and stainless steel balls, identical to the original for optimal function and a longer service life. Technical specifications Outer diameter: 28 mm Inner diameter: 15 mm Installation Replacing the bearings on your Polaris robot is very quick and easy to do yourself.