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Description: Compared with metal ball bearings, this provides the advantage of not requiring lubrication, also extend the service life. Rapid installation, snap rings fixed. Light weight and clean. Specificaitons: Type: RJMP-01-08 Color: Grey Inner diamenter: 8mm Outer diameter: 16mm Length: 25mm Net weight: 4g Package Included: 1x RJMP-01-08 LM8UU Solid Polymer