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Oiles bearings feature self-lubricating functions and demonstrate high performance, which normal plain bearings cannot provide, for fl uid lubrication, boundary lubrication, and dry friction fi elds. 8 Selection Guide Product Information Plastic Bearing Multi-layer Bearing Metallic Bearing Air Bearings Technical Slide Shifter Information Corporate Profi le Roller Bearings Roller bearings consist of ball or roller shaped rolling elements and casings and reduce friction by the principle of rollers. Major types ■ Ball bearings ■ Roller bearings ■ Needle bearings Normal Plain Bearings Normal plain bearings are made of a copper alloy, which requires lubrication. They are used in fluid lubrication and boundary lubrication fields. Major types ■ Plastic bearings ■ Metallic bearings Oiles Bearings (Self-Lubricating Bearings)