Bearings are the key to the smooth operation of machinery, so the material of each component is the key to bearing performance and durability. Common bearing materials include steel, ceramics, and plastics. Steel has strength and durability and is mainly used to make bearing rings and rolling elements. Each material is made of different components and has its own unique advantages. Steel is strong, copper alloys have excellent conductivity and corrosion resistance, while synthetic resins are lighter and reduce the risk of lubricant contamination.