A ball bearing is a rolling element bearing that uses balls to maintain the separation between the bearing races. This part is designed for use with outdoor lawn and garden power equipment such as snowblowers, chippers, shredders, and tillers. It is compatible with products by brands such as Craftsman, Cub Cadet, Ryobi, Troy-Bilt, Yard Machines, MTD, Huskee, Montgomery Wards, Bolens, Yard-Man, and MasterCut.The ball bearing part is crucial because its purpose is to reduce rotational friction while supporting radial and axial loads. Without functioning ball bearings, valuable outdoor equipment would fall apart and quickly stop working. That is why it is important to get any ball bearings replaced if they are worn out or malfunctioning.This ball bearing is made out of metal. The ball bearing is an original OEM part sourced directly from the manufacturer, MTD. It is sold individually.