The C60 ball bearing enables your Polaris pressure cleaner wheel to rotate freely and without interference. The Polaris C60 ball bearing wheel part number is for a single replacement bearing. In total, compatible Polaris cleaners require 8 bearings. Genuine Polaris wheel bearings are essential to the proper operation of a Polaris pressure-side cleaner. Refer to the Polaris cleaner owner’s manual for tips on proper wheel rpms.