This genuine replacement part is sourced directly from the original equipment manufacturer for use with Oster Pro clippers. It is a high-quality assembly and is sold individually, note that it includes the armature and the fan. Keep in mind the bearings and other components are all sold separately, make sure to refer to the appropriate diagrams of your model for the correct location and application of this item. Over time armature may wear out and begin to fail eventually requiring a replacement to ensure peak performance.